https://bugs.winehq.org/show_bug.cgi?id=40978
--- Comment #5 from Henri Verbeet hverbeet@gmail.com --- Oh, my guess would be that it's because previously it would use diffuse_d3dcolor(), etc. for loading D3DCOLOR attributes, and now it would use the generic vertex loading code. But the generic vertex loading code assumes the vertex shader takes care of any needed swizzling.