For the last two weeks I have been getting computational errors for all my MilkyWat@Home projects. I have the latest BOINC client (6.12.34 x64) running on a Win 7 Pro 64-bit system.

Before this time period, all projects were completing error free. Is there a new client update that I'm unaware of?

It is the drivers fault. You monitor going to sleep is also putting the GPU to sleep and erroring out all tasks.

The 2 solutions are either go back to a driver before 295.xx or turn off monitor sleep and manually turn off your monitor.

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and here i am going around and around thinking that it was something that was wrong with my hardware. (so that new gtx 580 was not bad, oh well i should get the replacement in 2 weeks)
thanks

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Fix it till it breaks, then Fix it again so it is Fixed right

Over the last month I too got constantly computational errors for all my MilkyWat@Home projects allways just after about 11 secs of work. Before it worked fine (with my non-double-math GPU). I've no idea how to let my system behave as before. Anyone out there having a splendid idea?

You are running MW as cpu only.

Your errors are:
"Failed to move file 'separation_checkpoint_tmp' to 'separation_checkpoint' (15100)"
"Failed to move file 'nbody_checkpoint_tmp_2324' to 'nbody_checkpoint' (15100)"

Writing a checkpoint fails with both mw apps.
There is a known problem if you are running your projects folder on an USB drive for example. I think Matt added a workaround that should fix it in the next release.