http://bugs.winehq.org/show_bug.cgi?id=24733
--- Comment #1 from Dan Kegel dank@kegel.com 2010-10-13 12:26:01 CDT --- That last statement was false - it should have read
The character selection screen's left side is all black if and only if you select shader model 3 in options (and restart so that takes effect).
So the character selection screen is the easiest place to see this problem, and the workaround is to select shader model 1 in Options / Advanced. (Though then you hit a different kind of black artifacting in Neriak, see bug 24630.)