http://bugs.winehq.org/show_bug.cgi?id=7229
--- Comment #22 from Jan H. Knudsen jan.h.knudsen@gmail.com 2008-01-19 16:11:02 --- I had this bug and I'm running on a dual core processor (Intel Core 2 Duo E6600 using 32-bit Ubuntu).
WoW usually locked up with this bug in BGs when I was making a fast turn with the camera or when the BG ended or other things suddenly happened.
The Schedtool suggestion fixed this bug completely for me, at least so far (2 days playing lots of BGs). And it has fixed WoW locking up when I went out to desktop with Ctrl-Alt-D and tried to get back in WoW.
So thank you, Stephan Wienczny!