http://bugs.winehq.org/show_bug.cgi?id=21525
--- Comment #9 from Rico kgbricola@web.de 2010-01-30 10:00:27 --- Ok, I could confirm the problem with AA enabled.
If AA is enabled, you also hit bug 14341 again.
When fbo and AA is enabled you get: fixme:d3d:stretch_rect_fbo >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from glBlitFramebuffer() @ ../../../git/dlls/wined3d/device.c / 5770
So then you probably wouldn't see the "wrong" dark polygons. There is no error output in the case of backbuffer.