http://bugs.winehq.org/show_bug.cgi?id=15156
--- Comment #4 from markk@clara.co.uk 2010-06-04 05:57:23 --- P.S.: You mentioned DirectDraw working fine. Could you double-check that? Try dragging the main emulation window around; on my system I get "trash" left behind all over the desktop. Also try dragging another window over the emulation window while the emulation is running in DirectDraw mode. (This is with WinUAE 2.1.0, but earlier versions have the same problem.)