I'm getting an error when I try to move the mouse outside the central "files" area of the screen. Ending the process via the task manager and restarting the app fixed it, but it felt worth reporting.
MusicBee v3.3.6858.32755 (Win10.0), 29 Apr 2019 16:08:
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at #=z9fwEJmlT1xd7RO$KIFa8W3y9QEn$.#=zlkVMLeoYuiOoEblusg==(Control #=zWmTZYZE=, #=zSFLrcTf2F$wjY3t2dJ$SYQg=[] #=zww2LwDVBBHIk, Point #=zrUOQvEk=)
at #=z9fwEJmlT1xd7RO$KIFa8W3y9QEn$.OnMouseMove(MouseEventArgs #=z5lhX0YM=)
at System.Windows.Forms.Control.WmMouseMove(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at #=zvhd2s2nEcGa85bUQlIdT24k=.WndProc(Message& #=zBrSk1rc=)
at #=z9fwEJmlT1xd7RO$KIFa8W3y9QEn$.WndProc(Message& #=zBrSk1rc=)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)