http://bugs.winehq.org/show_bug.cgi?id=12455
--- Comment #24 from Nicolay Doytchev lightrush@gmail.com 2008-05-27 14:33:15 --- You know what I guess this problem affected larger portion of games and the behaviour has already been changed in RC2 according to my testings of today. The problem does not exist anymore for Warcraft. Try it on Star Wars with RC2 and see if its ok there.
RC2 brought a new problem though ;) - when Warcraft looses focus and returns - textures disappear.
My overall idea is that this problem here/bugreport may be already obsolete.