Merge branch 'master' into hub-send-version-hash

osu.Game/Online/API/IAPIProvider.cs

@@ -111,6 +111,6 @@ namespace osu.Game.Online.API
         /// <param name="username">The username to create the account with.</param>
         /// <param name="password">The password to create the account with.</param>
         /// <returns>Any errors encoutnered during account creation.</returns>
-        RegistrationRequest.RegistrationRequestErrors CreateAccount(string email, string username, string password);
+        RegistrationRequest.RegistrationRequestErrors? CreateAccount(string email, string username, string password);
     }
 }

osu.Game/Overlays/Volume/VolumeMeter.cs

@@ -176,6 +176,7 @@ namespace osu.Game.Overlays.Volume
                     }
                 }
             };
+
             Bindable.ValueChanged += volume =>
             {
                 this.TransformTo("DisplayVolume",
@@ -183,6 +184,7 @@ namespace osu.Game.Overlays.Volume
                     400,
                     Easing.OutQuint);
             };
+
             bgProgress.Current.Value = 0.75f;
         }
 

osu.Game/Screens/BackgroundScreen.cs

@@ -68,15 +68,19 @@ namespace osu.Game.Screens
 
         public override bool OnExiting(IScreen next)
         {
-            this.FadeOut(transition_length, Easing.OutExpo);
-            this.MoveToX(x_movement_amount, transition_length, Easing.OutExpo);
+            if (IsLoaded)
+            {
+                this.FadeOut(transition_length, Easing.OutExpo);
+                this.MoveToX(x_movement_amount, transition_length, Easing.OutExpo);
+            }
 
             return base.OnExiting(next);
         }
 
         public override void OnResuming(IScreen last)
         {
-            this.MoveToX(0, transition_length, Easing.OutExpo);
+            if (IsLoaded)
+                this.MoveToX(0, transition_length, Easing.OutExpo);
             base.OnResuming(last);
         }
     }