Erm, I tried to change my rendering system from Direct3D9 (or something like that) to OpenGL... and I can't start my game up. If I DO use Direct3D9, there's just a lot of stuff missing (like parts in the ground, makings on my characters, etc.)
I got the Windows 8 Release preview and, honestly, most of my other stuff works fine. I don't want to use the Direct3D9 because of the glitchyness, but I suppose I'll have to deal if I can't figure something out. ^^