So I guess my 5-year old iMac which Apple insists it supports openCL 1.0, actually doesn't; that's the only thing I can think of that could be the culprit of all v7 7.05 GPU tasks failing with "computation error" status.

I should go ahead and disable the ATI GPU usage, but it seems like the only place I can do this is through project preferences, which will affect all computers on my account running seti@home, even those that are able of computing v7 7.05 results using an ATI GPU.

Any other way?

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Add a separate venue (home, school, work) for that iMac, change its location to that venue, change the use of the ATI GPU in that venue's project preferences.

To change the location of the iMac to the new venue, go to details of the iMac, scroll down to Location and change it from --- (default) to whichever venue you set up.

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Already done that; however, it would be more logical for that option to be in computing preferences, stored locally, since it a... local issue.

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The use of the GPU is a per project preference, not a global or local one.

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