http://bugs.winehq.org/show_bug.cgi?id=11584
--- Comment #41 from Vitaliy Margolen vitaliy@kievinfo.com 2008-05-01 13:22:19 --- (In reply to comment #40) The problem present with "backbuffer" and "pbuffer" "OffscreenRenderingMode"s. It does not happen with "fbo".
Here is the snipped of the code in question:
if (wined3d_settings.offscreen_rendering_mode != ORM_FBO) { IWineD3DSurface_PreLoad(target); }
As you see it's not being executed if you selected fbo off-screen rendering mode.