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Ac 16 Snow Leopard CPU problem

Anonymous
Not applicable
I am having a problem on a Mac Pro 2,1 with Snow Leopard where after a few hours of working, my mouse starts jumping around the screen as if the system has been overloaded. There seems to be an unusual amount of CPU load when this happens and I have to quit and restart archicad to be productive again, but it will return within and hour or two. I haven't determined what sort of action might trigger the problem and I have noticed a similar problem with another 3d program which makes me suspect that it is a system or hardware problem.

Has anyone else come across the same behavior and found a cause?

RAM is ECC and checks out ok.
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