Linux mining, "Verification failed, check hardware."

[Cablesaurus]

I installed Ubuntu 10.04 yesterday and was seemingly mining OK for awhile.
Today I re-setup Ubuntu  11.04 as a clean install due to some issues with setting up an LVM I'm having.

Long story short, I've resetup mining following the instructions on the first page of: http://forum.bitcoin.org/?topic=3359.0

Everything installed fine, and ./poclbm.py starts fine for a few seconds. Each of the 4 gpu's on the machine when tested individually will mine for about 10-20 seconds and then crap out with a "Verification failed, check hardware" message. I know all 4 GPU's aren't bad. Anyone know what might be worth checking in the software to troubleshoot?

[frozen]

Include "-v" on the command line (enable vectors) and the error message will go away:

Code:

./poclbm.py -v -d 1 ...

[Cablesaurus]

Include "-v" on the command line (enable vectors) and the error message will go away:

Code:

./poclbm.py -v -d 1 ...

Thank you kindly