Hi Mike, I recommend that you check into our online technical support (plow through the knowledge base until you find a "contact technician" button). Im not a tech support guy, so I don't want to give you bum advice. You should be as specific as possible about what you have installed. MacOS X is a moving target for all vendors, and 3D software uses a lot of stuff that's seen a lot of changes (like updates to OpenGL, etc). However, a little advice before you check with TS. Make sure you are not running any anti-virus software or software that makes auto-checks on the hard drive -- turn off Norton or Tech Tool, for example. Sometimes they move stuff around in memory. Also, download the latest video drivers from ATI. They do a great job on keeping their drivers up to date, but even they make mistakes once in a while. I also recommend a clean reinstall. Sometimes when instructions are written to disk in an uncivil way it can correct components. Hope that helps. Best regards, Lynn Fredricks e-on software