I have no experience with a mac but in windows when that occurs it is often lack of support software either in the OS or driver or both. You can try finding an updated driver for your gpu or install/update directx9. I would start with drivers if I were you.
If it is possible to do access the dx9 diagnostic program...in windows this would have been typing dxdiag at the run menu. Check your direct3d and so forth using the built in dx9 tests. This can help in eliminating hardware as a culprit.
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