diff --git a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs
index 5860480a91..b2b9fe2446 100644
--- a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs
+++ b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs
@@ -25,9 +25,6 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
                                          PatternType lastStair, IBeatmap originalBeatmap)
             : base(random, hitObject, beatmap, previousPattern, originalBeatmap)
         {
-            if (previousTime > hitObject.StartTime) throw new ArgumentOutOfRangeException(nameof(previousTime));
-            if (density < 0) throw new ArgumentOutOfRangeException(nameof(density));
-
             StairType = lastStair;
 
             TimingControlPoint timingPoint = beatmap.ControlPointInfo.TimingPointAt(hitObject.StartTime);
diff --git a/osu.Game/Beatmaps/BeatmapManager.cs b/osu.Game/Beatmaps/BeatmapManager.cs
index fc5a967f2d..1a2b5eadd9 100644
--- a/osu.Game/Beatmaps/BeatmapManager.cs
+++ b/osu.Game/Beatmaps/BeatmapManager.cs
@@ -351,7 +351,11 @@ namespace osu.Game.Beatmaps
             // let's make sure there are actually .osu files to import.
             string mapName = reader.Filenames.FirstOrDefault(f => f.EndsWith(".osu"));
             if (string.IsNullOrEmpty(mapName))
-                throw new InvalidOperationException($"No beatmap files found in this beatmap archive ({reader.Name}).");
+            {
+                // Todo: This is temporary for debugging purposes
+                var files = reader.Filenames.ToList();
+                throw new InvalidOperationException($"No beatmap files found in this beatmap archive. Files ({files.Count}): {string.Join(", ", files)}");
+            }
 
             Beatmap beatmap;
             using (var stream = new StreamReader(reader.GetStream(mapName)))
diff --git a/osu.Game/Beatmaps/Formats/Decoder.cs b/osu.Game/Beatmaps/Formats/Decoder.cs
index 2927654f62..6f45718390 100644
--- a/osu.Game/Beatmaps/Formats/Decoder.cs
+++ b/osu.Game/Beatmaps/Formats/Decoder.cs
@@ -55,11 +55,11 @@ namespace osu.Game.Beatmaps.Formats
             } while (line != null && line.Length == 0);
 
             if (line == null)
-                throw new IOException(@"Unknown file format");
+                throw new IOException(@"Unknown file format (null)");
 
-            var decoder = typedDecoders.Select(d => line.StartsWith(d.Key) ? d.Value : null).FirstOrDefault();
+            var decoder = typedDecoders.Select(d => line.StartsWith(d.Key, StringComparison.InvariantCulture) ? d.Value : null).FirstOrDefault();
             if (decoder == null)
-                throw new IOException(@"Unknown file format");
+                throw new IOException($@"Unknown file format ({line})");
 
             return (Decoder<T>)decoder.Invoke(line);
         }
diff --git a/osu.Game/Overlays/NotificationOverlay.cs b/osu.Game/Overlays/NotificationOverlay.cs
index d891cd96e8..78f8f57343 100644
--- a/osu.Game/Overlays/NotificationOverlay.cs
+++ b/osu.Game/Overlays/NotificationOverlay.cs
@@ -96,8 +96,7 @@ namespace osu.Game.Overlays
             base.LoadComplete();
 
             StateChanged += _ => updateProcessingMode();
-            OverlayActivationMode.ValueChanged += _ => updateProcessingMode();
-            OverlayActivationMode.TriggerChange();
+            OverlayActivationMode.BindValueChanged(_ => updateProcessingMode(), true);
         }
 
         private int totalCount => sections.Select(c => c.DisplayedCount).Sum();
diff --git a/osu.Game/Screens/Loader.cs b/osu.Game/Screens/Loader.cs
index c3b3e747fd..3cef20e510 100644
--- a/osu.Game/Screens/Loader.cs
+++ b/osu.Game/Screens/Loader.cs
@@ -9,6 +9,7 @@ using osu.Framework.Graphics.Shaders;
 using osu.Game.Screens.Menu;
 using OpenTK;
 using osu.Framework.Screens;
+using osu.Game.Overlays;
 
 namespace osu.Game.Screens
 {
@@ -18,6 +19,8 @@ namespace osu.Game.Screens
 
         protected override bool HideOverlaysOnEnter => true;
 
+        protected override OverlayActivation InitialOverlayActivationMode => OverlayActivation.Disabled;
+
         protected override bool AllowBackButton => false;
 
         public Loader()
diff --git a/osu.Game/Screens/Menu/ButtonSystem.cs b/osu.Game/Screens/Menu/ButtonSystem.cs
index 7f2bc1d357..b9a799328e 100644
--- a/osu.Game/Screens/Menu/ButtonSystem.cs
+++ b/osu.Game/Screens/Menu/ButtonSystem.cs
@@ -174,6 +174,9 @@ namespace osu.Game.Screens.Menu
                 ButtonSystemState lastState = state;
                 state = value;
 
+                if (game != null)
+                    game.OverlayActivationMode.Value = state == ButtonSystemState.Exit ? OverlayActivation.Disabled : OverlayActivation.All;
+
                 updateLogoState(lastState);
 
                 Logger.Log($"{nameof(ButtonSystem)}'s state changed from {lastState} to {state}");
@@ -205,11 +208,7 @@ namespace osu.Game.Screens.Menu
                         {
                             logoTracking = false;
 
-                            if (game != null)
-                            {
-                                game.OverlayActivationMode.Value = state == ButtonSystemState.Exit ? OverlayActivation.Disabled : OverlayActivation.All;
-                                game.Toolbar.Hide();
-                            }
+                            game?.Toolbar.Hide();
 
                             logo.ClearTransforms(targetMember: nameof(Position));
                             logo.RelativePositionAxes = Axes.Both;
@@ -243,11 +242,7 @@ namespace osu.Game.Screens.Menu
                                 if (impact)
                                     logo.Impact();
 
-                                if (game != null)
-                                {
-                                    game.OverlayActivationMode.Value = OverlayActivation.All;
-                                    game.Toolbar.State = Visibility.Visible;
-                                }
+                                game?.Toolbar.Show();
                             }, 200);
                             break;
                         default:
diff --git a/osu.Game/Skinning/LocalSkinOverrideContainer.cs b/osu.Game/Skinning/LocalSkinOverrideContainer.cs
index 3adf287cf7..25d9442e6f 100644
--- a/osu.Game/Skinning/LocalSkinOverrideContainer.cs
+++ b/osu.Game/Skinning/LocalSkinOverrideContainer.cs
@@ -85,12 +85,10 @@ namespace osu.Game.Skinning
         private void load(OsuConfigManager config)
         {
             beatmapSkins = config.GetBindable<bool>(OsuSetting.BeatmapSkins);
-            beatmapSkins.ValueChanged += val => onSourceChanged();
-            beatmapSkins.TriggerChange();
+            beatmapSkins.BindValueChanged(_ => onSourceChanged());
 
             beatmapHitsounds = config.GetBindable<bool>(OsuSetting.BeatmapHitsounds);
-            beatmapHitsounds.ValueChanged += val => onSourceChanged();
-            beatmapHitsounds.TriggerChange();
+            beatmapHitsounds.BindValueChanged(_ => onSourceChanged(), true);
         }
 
         protected override void LoadComplete()
diff --git a/osu.Game/Skinning/SkinReloadableDrawable.cs b/osu.Game/Skinning/SkinReloadableDrawable.cs
index f1ee0db6ce..0b94697405 100644
--- a/osu.Game/Skinning/SkinReloadableDrawable.cs
+++ b/osu.Game/Skinning/SkinReloadableDrawable.cs
@@ -52,5 +52,13 @@ namespace osu.Game.Skinning
         protected virtual void SkinChanged(ISkinSource skin, bool allowFallback)
         {
         }
+
+        protected override void Dispose(bool isDisposing)
+        {
+            base.Dispose(isDisposing);
+
+            if (skin != null)
+                skin.SourceChanged -= onChange;
+        }
     }
 }