http://bugs.winehq.org/show_bug.cgi?id=5535
--- Comment #77 from Alex Bradbury asb@asbradbury.org 2011-07-03 06:32:36 CDT --- (In reply to comment #76)
Apologies, the glitches are with opengl, which indeed are present. Also, the background below the cursor becomes a black box and leaves a trail, which then the game seems to recover from.
It seems likely that bug #22493 for Baldurs Gate 2 describes the same issue (both games use the same engine and the symptoms are the same).