I have a dual monitor setup, error is the same regardless of which monitor is the 'main,' ie, has the menubar on it.
Symptom: The game drops into macsbug with an error in IsValidTexture, stdlog dump saved and available on request.
Video Cards, ATI Xclaim XV 128 (16M) and Voodoo3/2000.
Machine: Starmax 3000/180, upgraded to G3 300/1M, 160 M memory, no VM.