I'm trying to get a screensaver running, and it appears to start working, until it seems to carry out a test: fixme:d3d:test_pbo_functionality >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from Loading the PBO test texture @ directx.c / 3563 at which time it decides i don't have direct3D and bombs out. Would simple DLL override work against this, or is it something more complex? i've done a search, and this error messages seems to appear quite a lot from what i can see, but with no fix. any help / pointers whatsoever are gratefully recieved. TIA Steve