http://bugs.winehq.org/show_bug.cgi?id=20898
--- Comment #13 from yradenac@free.fr 2009-12-09 14:21:40 --- I have undone the patch and updated my git repository to the last version: the bug is fixed for me, both for the demo and for the full game.
The only thing that bothers me is that it seems I'm the only one who experienced that bug...
Anyway, thank you very much!