More missed exceptions.

osu.Game.Rulesets.Mania/Timing/ControlPointContainer.cs

@@ -51,7 +51,7 @@ public override void Add(Drawable drawable)
             var controlPoint = drawableControlPoints.LastOrDefault(t => t.CanContain(drawable)) ?? drawableControlPoints.FirstOrDefault();
 
             if (controlPoint == null)
-                throw new Exception("Could not find suitable timing section to add object to.");
+                throw new InvalidOperationException("Could not find suitable timing section to add object to.");
 
             controlPoint.Add(drawable);
         }

osu.Game.Rulesets.Mania/UI/ManiaHitRenderer.cs

@@ -34,7 +34,7 @@ protected override Playfield<ManiaHitObject, ManiaJudgement> CreatePlayfield()
             ControlPoint firstTimingChange = Beatmap.TimingInfo.ControlPoints.FirstOrDefault(t => t.TimingChange);
 
             if (firstTimingChange == null)
-                throw new Exception("The Beatmap contains no timing points!");
+                throw new InvalidOperationException("The Beatmap contains no timing points!");
 
             // Generate the timing points, making non-timing changes use the previous timing change
             var timingChanges = Beatmap.TimingInfo.ControlPoints.Select(c =>

osu.Game/Online/API/APIAccess.cs

@@ -288,7 +288,7 @@ private void flushQueue(bool failOldRequests = true)
             {
                 APIRequest req;
                 while (oldQueue.TryDequeue(out req))
-                    req.Fail(new Exception(@"Disconnected from server"));
+                    req.Fail(new WebException(@"Disconnected from server"));
             }
         }