For some time now, whenever I come back to my work Windows desktop after letting BOINC run for a while, I see the Windows "an error has occurred in your application" for ACEMD2_*. More recently, this has started happening on my home Windows machine too. I updated the BOINC client from 6.10.58 to 6.12.34 at home, but that hasn't helped. I've been sending crash details (presumably to Microsoft) religiously.

And it seems the result of this is that my GPUGRID tasks on both machines are totally stuck at 0% complete.

My work machine is a Quadro NVS 290 (if I recall correctly), and home is a GeForce 8800 GT.

How can I prevent these errors from happening, or provide diagnostic information if it's a bug?

Have you read this FAQ yet?
Disable long workunits in your GPUGrid profile.
Disable any screensavers on your PCs.
Disable any other GPU utilizing (background) applications.
Read FAQ.
Your GeForce 8800 GT can finish GPUGrid tasks before the 5 days deadline (if you run it 24/7), but your Quadro NVS 290 is not, so it's not worth using it in GPUGrid.
See this FAQ.

Alex, the NVIDIA Quadro NVS 290 uses a G86 core and only has 16shaders. This card would be incapable of completing any task in time. Your 8800 GT has 112shaders but it's 4 generations old, and fails most tasks. The one task you did recently return was not returned and reported within 5days, so it did not get any credit. In my opinion neither card is up to the rigors of GPUGrid crunching. You might be able to use them on Einstein, if you want.

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FAQ's

HOW TO:
- Opt out of Beta Tests
- Ask for Help

Thanks to you both for this information! I'll drop the GPUGRID project from my work machine (Quadro NVS 290), and keep an eye on my home machine (GeForce 8800 GT), which after updating the video drivers and resetting the project doesn't appear to be having the crashing issue, unless my wife is just closing out the error message before I see it... but if it's too slow, indeed there's no point in having it there either. (I have to admit I don't run BOINC on that PC 24x7 any more, since the fan noise gets really loud...)