To resolve this issue:
- Make sure you have a video card with at least 6MB of video memory. If you do not, you will need to run the game in software mode.
- If you do have a 6MB video card, you may need to update the OpenGL extensions on your MAC.
- Also, turning off virtual memory, and closing any open extensions can help with this problem.
- If using a Powerbook, in the Energy Saver Control Panel (Advanced Settings), turn off (uncheck) Allow Processor Cycling and Reduce Processor Speed.