http://bugs.winehq.org/show_bug.cgi?id=17911
--- Comment #9 from Christoph Korn c_korn@gmx.de 2009-04-17 16:26:56 --- The problem seems to be related to the shadow quality.
The stripe also occurs with shader 1.4 and medium shadow quality. The stripe does not occur with shader 1.4 and no shadow.