http://bugs.winehq.org/show_bug.cgi?id=10423
--- Comment #19 from Wylda wylda@volny.cz 2010-09-04 17:41:42 CDT --- Created an attachment (id=30561) --> (http://bugs.winehq.org/attachment.cgi?id=30561) savegame
The savegame SHOULD show you the problem. Just climb up the ladder and on top of it you should see the incorrectly-white turret...
There is one interesting thing which took me a while. I could not give you save where you are standing in front of turret, because such save after loading show the turret OK. The key is to start the save game below the the turret and that's the reason you need to climb up to see the problem.