http://bugs.winehq.org/show_bug.cgi?id=18371
--- Comment #2 from Daniel Santos daniel.santos@pobox.com 2009-05-09 21:15:06 --- Further experimentation has revealed that the mouse cursor becomes corrupted when focus to the application window is lost. If I have another window up front and I mouse over an area in the game window that changes the cursor, the cursor will be restored. Then if I change focus to the game window, the cursor is still OK, so it doesn't happen when the window gains focus, only when it looses it.
This could possibly be related to another bug where the game sometimes crashes when (in windowed mode) you change focus away and then back to the game (it always happens when the window is gaining focus).