Please update me on this one, as I havent yet seen the conclusive answer.
I've looked around the Apple downloads site as suggested, but I can't see any reference to the driver updates that you mention for my ATI Card. (name ATI Mach6_3DU, model ATY GT-B, in a beige G3 266). The absence of anything on the site seems to indicate there is no upgrade, whilst the ATI site recommends I go back to the Apple site.
Please tell me the exact name and the web location of the file you recommend.
Alternatively you suggest turning off extensions, but I notice I have six. Which of these is causing the problem?
ATI 3D accelerator 4.9.3
ATI Driver Update 1.4.8
ATI Rage 128 3D accelerator 5.6.9
ATI Resource Manager 2.1.5
ATI Video accelerator 4.3.3
ATI Video Memory Manager 7.5
(Mac OS 8.5)