diff --git a/app/build.gradle b/app/build.gradle
index bb47167c..686defd3 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -31,8 +31,8 @@ android {
         testApplicationId "ac.mdiq.podcini.tests"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 
-        versionCode 3020250
-        versionName "6.6.5"
+        versionCode 3020251
+        versionName "6.6.6"
 
         applicationId "ac.mdiq.podcini.R"
         def commit = ""
diff --git a/app/src/main/kotlin/ac/mdiq/podcini/playback/base/InTheatre.kt b/app/src/main/kotlin/ac/mdiq/podcini/playback/base/InTheatre.kt
index b7adccb3..c200519e 100644
--- a/app/src/main/kotlin/ac/mdiq/podcini/playback/base/InTheatre.kt
+++ b/app/src/main/kotlin/ac/mdiq/podcini/playback/base/InTheatre.kt
@@ -25,18 +25,39 @@ object InTheatre {
 
     var curEpisode: Episode? = null     // unmanged
         set(value) {
-            field = if (value != null) unmanaged(value) else null
-            if (field?.media != null && curMedia?.getIdentifier() != field?.media?.getIdentifier()) curMedia = unmanaged(field!!.media!!)
+            when {
+                value != null -> {
+                    field = unmanaged(value)
+                    if (field?.media != null && curMedia?.getIdentifier() != field?.media?.getIdentifier()) curMedia = unmanaged(field!!.media!!)
+                }
+                else -> {
+                    field = null
+                    if (curMedia != null) curMedia = null
+                }
+            }
+//            field = if (value != null) unmanaged(value) else null
+//            if (field?.media != null && curMedia?.getIdentifier() != field?.media?.getIdentifier()) curMedia = unmanaged(field!!.media!!)
         }
 
     var curMedia: Playable? = null      // unmanged if EpisodeMedia
         set(value) {
-            if (value is EpisodeMedia) {
-                field = unmanaged(value)
-                if (value.episode != null && curEpisode?.id != value.episode?.id) curEpisode = unmanaged(value.episode!!)
-            } else {
-                field = value
+            when {
+                value is EpisodeMedia -> {
+                    field = unmanaged(value)
+                    if (value.episode != null && curEpisode?.id != value.episode?.id) curEpisode = unmanaged(value.episode!!)
+                }
+                value == null -> {
+                    field = null
+                    if (curEpisode != null) curEpisode = null
+                }
+                else -> field = value
             }
+//            if (value is EpisodeMedia) {
+//                field = unmanaged(value)
+//                if (value.episode != null && curEpisode?.id != value.episode?.id) curEpisode = unmanaged(value.episode!!)
+//            } else {
+//                field = value
+//            }
         }
 
     var curState: CurrentState      // managed
diff --git a/app/src/main/kotlin/ac/mdiq/podcini/playback/service/PlaybackService.kt b/app/src/main/kotlin/ac/mdiq/podcini/playback/service/PlaybackService.kt
index a8e1a5ea..d4a9bd7f 100644
--- a/app/src/main/kotlin/ac/mdiq/podcini/playback/service/PlaybackService.kt
+++ b/app/src/main/kotlin/ac/mdiq/podcini/playback/service/PlaybackService.kt
@@ -66,6 +66,7 @@ import ac.mdiq.podcini.util.FlowEvent.PlayEvent.Action
 import ac.mdiq.podcini.util.IntentUtils.sendLocalBroadcast
 import ac.mdiq.podcini.util.Logd
 import ac.mdiq.podcini.util.config.ClientConfig
+import ac.mdiq.podcini.util.showStackTrace
 import ac.mdiq.vista.extractor.MediaFormat
 import ac.mdiq.vista.extractor.stream.AudioStream
 import ac.mdiq.vista.extractor.stream.DeliveryMethod
@@ -1073,8 +1074,8 @@ class PlaybackService : MediaLibraryService() {
 //            Logd(TAG, "onQueueEvent: ending playback curEpisode ${curEpisode?.title}")
             notifyCurQueueItemsChanged()
             for (e in event.episodes) {
-                Logd(TAG, "onQueueEvent: queue event removed ${e.title}")
                 if (e.id == curEpisode?.id) {
+                    Logd(TAG, "onQueueEvent: queue event removed ${e.title}")
                     mPlayer?.endPlayback(hasEnded = false, wasSkipped = true, shouldContinue = true, toStoppedState = true)
                     break
                 }
@@ -1758,18 +1759,18 @@ class PlaybackService : MediaLibraryService() {
         override fun setVolume(volumeLeft: Float, volumeRight: Float) {
             var volumeLeft = volumeLeft
             var volumeRight = volumeRight
+            Logd(TAG, "setVolume: $volumeLeft $volumeRight")
             val playable = curMedia
             if (playable is EpisodeMedia) {
                 val preferences = playable.episodeOrFetch()?.feed?.preferences
                 if (preferences != null) {
                     val volumeAdaptionSetting = preferences.volumeAdaptionSetting
-                    if (volumeAdaptionSetting != null) {
-                        val adaptionFactor = volumeAdaptionSetting.adaptionFactor
-                        volumeLeft *= adaptionFactor
-                        volumeRight *= adaptionFactor
-                    }
+                    val adaptionFactor = volumeAdaptionSetting.adaptionFactor
+                    volumeLeft *= adaptionFactor
+                    volumeRight *= adaptionFactor
                 }
             }
+            Logd(TAG, "setVolume 1: $volumeLeft $volumeRight")
             if (volumeLeft > 1) {
                 exoPlayer?.volume = 1f
                 loudnessEnhancer?.setEnabled(true)
@@ -1869,6 +1870,7 @@ class PlaybackService : MediaLibraryService() {
             val position = getPosition()
             if (position >= 0) curMedia?.setPosition(position)
             Logd(TAG, "endPlayback hasEnded=$hasEnded wasSkipped=$wasSkipped shouldContinue=$shouldContinue toStoppedState=$toStoppedState")
+//            showStackTrace()
 
             val currentMedia = curMedia
             var nextMedia: Playable? = null
@@ -2563,9 +2565,7 @@ class PlaybackService : MediaLibraryService() {
                     playbackService?.mPlayer?.prepare()
                     playbackService?.taskManager?.restartSleepTimer()
                 }
-                else -> {
-                    Log.w(TAG, "Play/Pause button was pressed and PlaybackService state was unknown")
-                }
+                else -> Log.w(TAG, "Play/Pause button was pressed and PlaybackService state was unknown")
             }
         }
 
diff --git a/app/src/main/kotlin/ac/mdiq/podcini/storage/database/Episodes.kt b/app/src/main/kotlin/ac/mdiq/podcini/storage/database/Episodes.kt
index 62a6a0d1..2f89abda 100644
--- a/app/src/main/kotlin/ac/mdiq/podcini/storage/database/Episodes.kt
+++ b/app/src/main/kotlin/ac/mdiq/podcini/storage/database/Episodes.kt
@@ -25,11 +25,10 @@ import ac.mdiq.podcini.storage.model.EpisodeMedia
 import ac.mdiq.podcini.storage.model.EpisodeSortOrder
 import ac.mdiq.podcini.storage.utils.EpisodesPermutors.getPermutor
 import ac.mdiq.podcini.storage.utils.FilesUtils.getMediafilename
-import ac.mdiq.podcini.util.IntentUtils.sendLocalBroadcast
-import ac.mdiq.podcini.util.Logd
 import ac.mdiq.podcini.util.EventFlow
 import ac.mdiq.podcini.util.FlowEvent
-import ac.mdiq.vista.extractor.playlist.PlaylistInfo
+import ac.mdiq.podcini.util.IntentUtils.sendLocalBroadcast
+import ac.mdiq.podcini.util.Logd
 import ac.mdiq.vista.extractor.stream.StreamInfo
 import ac.mdiq.vista.extractor.stream.StreamInfoItem
 import android.app.backup.BackupManager
@@ -240,10 +239,13 @@ object Episodes {
      * @param date PlaybackCompletionDate for `media`
      */
     fun addToHistory(episode: Episode, date: Date? = Date()) : Job {
-        Logd(TAG, "addToHistory called")
+        Logd(TAG, "addToHistory called played: ${episode.playState}")
         return runOnIOScope {
-            upsert(episode) { it.media?.playbackCompletionDate = date }
-            EventFlow.postEvent(FlowEvent.HistoryEvent())
+            val episode_ = realm.query(Episode::class).query("id == $0", episode.id).first().find()
+            if (episode_ != null) {
+                upsert(episode_) { it.media?.playbackCompletionDate = date }
+                EventFlow.postEvent(FlowEvent.HistoryEvent())
+            }
         }
     }
 
@@ -274,7 +276,7 @@ object Episodes {
 
     @OptIn(UnstableApi::class)
     suspend fun setPlayStateSync(played: Int, resetMediaPosition: Boolean, episode: Episode) : Episode {
-        Logd(TAG, "setPlayStateSync called resetMediaPosition: $resetMediaPosition")
+        Logd(TAG, "setPlayStateSync called played: $played resetMediaPosition: $resetMediaPosition ${episode.title}")
         val result = upsert(episode) {
             if (played >= PlayState.NEW.code && played <= PlayState.BUILDING.code) it.playState = played
             else {
@@ -284,6 +286,7 @@ object Episodes {
             if (resetMediaPosition) it.media?.setPosition(0)
         }
         if (played == PlayState.PLAYED.code && shouldMarkedPlayedRemoveFromQueues()) removeFromAllQueuesSync(result)
+        Logd(TAG, "setPlayStateSync played: ${result.playState}")
         EventFlow.postEvent(FlowEvent.EpisodePlayedEvent(result))
         return result
     }
diff --git a/app/src/main/kotlin/ac/mdiq/podcini/storage/model/VolumeAdaptionSetting.kt b/app/src/main/kotlin/ac/mdiq/podcini/storage/model/VolumeAdaptionSetting.kt
index c5ad3d31..820e5d1e 100644
--- a/app/src/main/kotlin/ac/mdiq/podcini/storage/model/VolumeAdaptionSetting.kt
+++ b/app/src/main/kotlin/ac/mdiq/podcini/storage/model/VolumeAdaptionSetting.kt
@@ -6,9 +6,12 @@ enum class VolumeAdaptionSetting(private val value: Int, @JvmField val adaptionF
     OFF(0, 1.0f, R.string.feed_volume_reduction_off),
     LIGHT_REDUCTION(1, 0.5f, R.string.feed_volume_reduction_light),
     HEAVY_REDUCTION(2, 0.2f, R.string.feed_volume_reduction_heavy),
-    LIGHT_BOOST(3, 1.5f, R.string.feed_volume_boost_light),
-    MEDIUM_BOOST(4, 2f, R.string.feed_volume_boost_medium),
-    HEAVY_BOOST(5, 2.5f, R.string.feed_volume_boost_heavy);
+//    LIGHT_BOOST(3, 1.5f, R.string.feed_volume_boost_light),
+//    MEDIUM_BOOST(4, 2f, R.string.feed_volume_boost_medium),
+//    HEAVY_BOOST(5, 2.5f, R.string.feed_volume_boost_heavy);
+    LIGHT_BOOST(3, 2f, R.string.feed_volume_boost_light),
+    MEDIUM_BOOST(4, 4f, R.string.feed_volume_boost_medium),
+    HEAVY_BOOST(5, 7f, R.string.feed_volume_boost_heavy);
 
     fun toInteger(): Int {
         return value
diff --git a/app/src/main/kotlin/ac/mdiq/podcini/ui/activity/MainActivity.kt b/app/src/main/kotlin/ac/mdiq/podcini/ui/activity/MainActivity.kt
index d2b82f88..ef78c73a 100644
--- a/app/src/main/kotlin/ac/mdiq/podcini/ui/activity/MainActivity.kt
+++ b/app/src/main/kotlin/ac/mdiq/podcini/ui/activity/MainActivity.kt
@@ -32,9 +32,9 @@ import ac.mdiq.podcini.ui.utils.LockableBottomSheetBehavior
 import ac.mdiq.podcini.ui.utils.ThemeUtils.getDrawableFromAttr
 import ac.mdiq.podcini.ui.utils.TransitionEffect
 import ac.mdiq.podcini.ui.view.EpisodesRecyclerView
-import ac.mdiq.podcini.util.Logd
 import ac.mdiq.podcini.util.EventFlow
 import ac.mdiq.podcini.util.FlowEvent
+import ac.mdiq.podcini.util.Logd
 import android.Manifest
 import android.annotation.SuppressLint
 import android.content.ComponentName
diff --git a/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/AllEpisodesFragment.kt b/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/AllEpisodesFragment.kt
index b479509b..acc846c5 100644
--- a/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/AllEpisodesFragment.kt
+++ b/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/AllEpisodesFragment.kt
@@ -76,7 +76,7 @@ import kotlin.math.min
         }
         if (allEpisodes.isEmpty()) return listOf()
         allEpisodes = allEpisodes.filter { filter.matchesForQueues(it) }
-        return allEpisodes.subList(0, min(allEpisodes.size-1, page * EPISODES_PER_PAGE))
+        return allEpisodes.subList(0, min(allEpisodes.size, page * EPISODES_PER_PAGE))
     }
 
     override fun loadMoreData(page: Int): List<Episode> {
diff --git a/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/AudioPlayerFragment.kt b/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/AudioPlayerFragment.kt
index 8d885b37..fa4a340b 100644
--- a/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/AudioPlayerFragment.kt
+++ b/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/AudioPlayerFragment.kt
@@ -170,7 +170,7 @@ class AudioPlayerFragment : Fragment(), SeekBar.OnSeekBarChangeListener, Toolbar
         cardViewSeek = binding.cardViewSeek
 
         initDetailedView()
-
+        (activity as MainActivity).setPlayerVisible(false)
         return binding.root
     }
 
@@ -199,7 +199,7 @@ class AudioPlayerFragment : Fragment(), SeekBar.OnSeekBarChangeListener, Toolbar
         if (isCollapsed) {
             isCollapsed = false
             playerUI = playerUI2
-            playerUI?.updateUi(currentMedia)
+            if (currentMedia != null) playerUI?.updateUi(currentMedia!!)
             playerUI?.butPlay?.setIsShowPlay(isShowPlay)
             playerDetailsFragment?.updateInfo()
         }
@@ -209,7 +209,7 @@ class AudioPlayerFragment : Fragment(), SeekBar.OnSeekBarChangeListener, Toolbar
         Logd(TAG, "onCollaped()")
         isCollapsed = true
         playerUI = playerUI1
-        playerUI?.updateUi(currentMedia)
+        if (currentMedia != null) playerUI?.updateUi(currentMedia!!)
         playerUI?.butPlay?.setIsShowPlay(isShowPlay)
     }
 
@@ -256,7 +256,7 @@ class AudioPlayerFragment : Fragment(), SeekBar.OnSeekBarChangeListener, Toolbar
                     val item = (currentMedia as? EpisodeMedia)?.episodeOrFetch()
                     if (item != null) playerDetailsFragment?.setItem(item)
                     updateUi()
-                    playerUI?.updateUi(currentMedia)
+                    if (currentMedia != null) playerUI?.updateUi(currentMedia!!)
 //                TODO: disable for now
 //                if (!includingChapters) loadMediaInfo(true)
                 }.invokeOnCompletion { throwable ->
@@ -363,7 +363,7 @@ class AudioPlayerFragment : Fragment(), SeekBar.OnSeekBarChangeListener, Toolbar
         val media = event.media ?: return
         if (currentMedia?.getIdentifier() == null || media.getIdentifier() != currentMedia?.getIdentifier()) {
             currentMedia = media
-            playerUI?.updateUi(currentMedia)
+            playerUI?.updateUi(currentMedia!!)
             playerDetailsFragment?.setItem(curEpisode!!)
         }
         playerUI?.onPositionUpdate(event)
@@ -707,7 +707,9 @@ class AudioPlayerFragment : Fragment(), SeekBar.OnSeekBarChangeListener, Toolbar
         fun onPlaybackServiceChanged(event: FlowEvent.PlaybackServiceEvent) {
             when (event.action) {
                 FlowEvent.PlaybackServiceEvent.Action.SERVICE_SHUT_DOWN -> (activity as MainActivity).setPlayerVisible(false)
-                FlowEvent.PlaybackServiceEvent.Action.SERVICE_STARTED -> (activity as MainActivity).setPlayerVisible(true)
+                FlowEvent.PlaybackServiceEvent.Action.SERVICE_STARTED -> {
+                    if (curMedia != null) (activity as MainActivity).setPlayerVisible(true)
+                }
 //                PlaybackServiceEvent.Action.SERVICE_RESTARTED -> (activity as MainActivity).setPlayerVisible(true)
             }
         }
@@ -736,9 +738,9 @@ class AudioPlayerFragment : Fragment(), SeekBar.OnSeekBarChangeListener, Toolbar
             }
         }
         @UnstableApi
-        fun updateUi(media: Playable?) {
+        fun updateUi(media: Playable) {
             Logd(TAG, "updateUi called $media")
-            if (media == null) return
+//            if (media == null) return
             binding.titleView.text = media.getEpisodeTitle()
 //            (activity as MainActivity).setPlayerVisible(true)
             onPositionUpdate(FlowEvent.PlaybackPositionEvent(media, media.getPosition(), media.getDuration()))
@@ -815,7 +817,7 @@ class AudioPlayerFragment : Fragment(), SeekBar.OnSeekBarChangeListener, Toolbar
 
         @UnstableApi override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
             Logd(TAG, "fragment onCreateView")
-            _binding = PlayerDetailsFragmentBinding.inflate(inflater)
+            _binding = PlayerDetailsFragmentBinding.inflate(inflater, container, false)
 
             val colorFilter: ColorFilter? = BlendModeColorFilterCompat.createBlendModeColorFilterCompat(binding.txtvPodcastTitle.currentTextColor, BlendModeCompat.SRC_IN)
             binding.butNextChapter.colorFilter = colorFilter
diff --git a/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/HistoryFragment.kt b/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/HistoryFragment.kt
index 758b946f..73d5074b 100644
--- a/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/HistoryFragment.kt
+++ b/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/HistoryFragment.kt
@@ -171,7 +171,7 @@ import kotlin.math.min
             loadItemsRunning = false
         }
         if (allHistory.isEmpty()) return listOf()
-        return allHistory.subList(0, min(allHistory.size-1, page * EPISODES_PER_PAGE))
+        return allHistory.subList(0, min(allHistory.size, page * EPISODES_PER_PAGE))
     }
 
     override fun loadMoreData(page: Int): List<Episode> {
diff --git a/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/OnlineFeedFragment.kt b/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/OnlineFeedFragment.kt
index 70ddaae0..46919d62 100644
--- a/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/OnlineFeedFragment.kt
+++ b/app/src/main/kotlin/ac/mdiq/podcini/ui/fragment/OnlineFeedFragment.kt
@@ -597,7 +597,7 @@ class OnlineFeedFragment : Fragment() {
                     val feed1 = getFeed(feedId, true)?: return
                     if (feed1.preferences == null) feed1.preferences = FeedPreferences(feed1.id, false,
                         FeedPreferences.AutoDeleteAction.GLOBAL, VolumeAdaptionSetting.OFF, "", "")
-                    if (feedSource != "VistaGuide") {
+                    if (feedSource == "VistaGuide") {
                         feed1.preferences!!.prefStreamOverDownload = true
                         feed1.preferences!!.autoDownload = false
                     } else if (isEnableAutodownload) {
@@ -823,7 +823,7 @@ class OnlineFeedFragment : Fragment() {
         }
         override fun loadData(): List<Episode> {
             if (episodeList.isEmpty()) return listOf()
-            return episodeList.subList(0, min(episodeList.size-1, page * EPISODES_PER_PAGE))
+            return episodeList.subList(0, min(episodeList.size, page * EPISODES_PER_PAGE))
         }
         override fun loadMoreData(page: Int): List<Episode> {
             val offset = (page - 1) * EPISODES_PER_PAGE
diff --git a/build.gradle b/build.gradle
index afb1d008..08e3bb7a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,7 +14,7 @@ buildscript {
 
 plugins {
     alias(libs.plugins.compose.compiler) apply false
-    id 'io.realm.kotlin' version '2.1.0' apply false
+    id 'io.realm.kotlin' version '2.3.0' apply false
 }
 
 allprojects {
diff --git a/changelog.md b/changelog.md
index 367c4600..cc684b28 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,13 @@
+# 6.6.6
+
+* fixed difference between the count of episodes and the actual number of episodes (seen when the number is small) in History, AllEpisodes, and OnlineFeed views
+* fixed an error (introduced in 6.6.3) in setting feed preferences when subscribing one
+* upon start, if no previously played media, the player is set invisible
+* fixed an issue of fully played episode not correctly recorded as such when Podcini is in the background
+* volume adaptation numbers were changed from 0.2, 0.5, 1, 1.5, 2, 2.5 to 0.2, 0.5, 1, 2, 4, 7 (the max boost being 6dB)
+* Kotlin upped to 2.0.20
+* Realm upped to 2.3.0
+
 # 6.6.5
 
 * fixed the issue of subscriptions not filtered correctly.
diff --git a/fastlane/metadata/android/en-US/changelogs/3020251.txt b/fastlane/metadata/android/en-US/changelogs/3020251.txt
new file mode 100644
index 00000000..73fdaee3
--- /dev/null
+++ b/fastlane/metadata/android/en-US/changelogs/3020251.txt
@@ -0,0 +1,9 @@
+ Version 6.6.6:
+
+* fixed difference between the count of episodes and the actual number of episodes (seen when the number is small) in History, AllEpisodes, and OnlineFeed views
+* fixed an error (introduced in 6.6.3) in setting feed preferences when subscribing one
+* upon start, if no previously played media, the player is set invisible
+* fixed an issue of fully played episode not correctly recorded as such when Podcini is in the background
+* volume adaptation numbers were changed from 0.2, 0.5, 1, 1.5, 2, 2.5 to 0.2, 0.5, 1, 2, 4, 7 (the max boost being 6dB)
+* Kotlin upped to 2.0.20
+* Realm upped to 2.3.0
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 70a44f6d..44bc4fc1 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,6 +1,6 @@
  
 [versions]
-kotlin = "2.0.10"
+kotlin = "2.0.20"
 
 [plugins]
 org-jetbrains-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }