Crashing with Skitch, Snapz Pro, Fast User Switching - graphics card issue?

Noticed this issue when I switched back to a G5 from a Mac Pro.
Clean install of the OS and apps but Skitch locked the machine when accessing prefs etc. in the app. Then discovered Snapz Pro locked the machine when attempting to screen grab. Now, after creating a new user account and activating Fast User Switching the machine locks when switching to the new user.
Could this be an Open GL or Quartz Extreme issue? Ran Xbench and everything went fine. Normal day to day use of the machine is sound.
System Profiler tells me this about the graphics card:
*ATI Radeon X800 XT:*
Chipset Model: ATY,R420
Type: Display
Bus: AGP
Slot: SLOT-1
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x4a48
Revision ID: 0x0000
ROM Revision: 113-A35801-109
I just flashed the ROM to 109 (from 108) today, but still have the issue.
Thoughts?

Malcom,
If I turn it off, then I lose the ability to jump between users without having to kill everything I'm doing. Yes, that does solve the problem, but only because it removes the cause of the problem. I'm trying to find a solution to the issue.
-Steve

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