Starting last night my computer hasn't been assigned any tasks.
I've upped my resource share to 1000 (78%).
I've allowed the server to assign tasks from the short queue.
I've increased the work buffer from 0.6 days to 1.8 days [usually takes 25 hours to run a long task on my GTX 460].

My CPU projects, World Community Grid & FightMalaria@Home, are crunching away.

Any diagnosis would be appreciated.

You should not set the buffer so high (only 0,1 or less?), that costs you only points because you miss the 125% Bonus for sending the units back inner 2 Days. I see your only one from todays is validated. The ones before are mostly erroring, so i would say, the server did not send you more units on that days because you produced so much errors. The second thing i would try to stop cpu work for two days only to test if it reduce perhaps the errorrate or leave one cpu core free with no work. When i does not work, try to set 25mV more GPU Voltage and perhaps the GPU Clock 50-100Mhz lower when it doesnt help. The third thing because i see your computer is running Win7 is, do you run the units in one piece without reboot, logout or user switching? Because these three Events can crash the units too, in this case do do not need to change anything on your system, only let the units compute in one piece.
____________
DSKAG Austria Research Team: http://www.research.dskag.at

Thanks for the quick advice, but there's a few things I really don't know how to implement. How do I leave one CPU free, and why would that help? Would telling GPU grid to use up to 100% of a CPU do the same effect?

How do I send more voltage to the GPU?

I'm trying to reboot as little as possible (I'm the only user). Sometimes after running GPUgrid tasks for a few hours, the PC will become unresponsive - the screen stays black and does not respond to mouse and keyboard input, but I can hear the fans running full crunching power.

During those times I tend to reboot, and when I come back, 60% of the time the workunit will have failed.

Temp on the card isn't going past ~75 C.

Thanks for the quick advice, but there's a few things I really don't know how to implement. How do I leave one CPU free, and why would that help? Would telling GPU grid to use up to 100% of a CPU do the same effect?

How do I send more voltage to the GPU?

I'm trying to reboot as little as possible (I'm the only user). Sometimes after running GPUgrid tasks for a few hours, the PC will become unresponsive - the screen stays black and does not respond to mouse and keyboard input, but I can hear the fans running full crunching power.

During those times I tend to reboot, and when I come back, 60% of the time the workunit will have failed.

Temp on the card isn't going past ~75 C.

No new tasks since my first post.
I was able to run the GPU version of Einstein@Home, so I know BOINC is recognizing my card. And there haven't been any crashes.

I went back in the event log, and I've got days and days of this.

8/6/2013 9:13:43 AM | GPUGRID | update requested by user
8/6/2013 9:13:45 AM | GPUGRID | Sending scheduler request: Requested by user.
8/6/2013 9:13:45 AM | GPUGRID | Requesting new tasks for NVIDIA
8/6/2013 9:14:14 AM | GPUGRID | Scheduler request completed: got 0 new tasks
8/6/2013 9:14:14 AM | GPUGRID | No tasks sent

Stopped all new work and stopped all other projects from updating. Temporarily ramped the work buffer to five days just to rule that out as a cause. The last hour or so of tasks is finishing now.

And still...

8/6/2013 9:20:44 AM | GPUGRID | Sending scheduler request: Requested by user.
8/6/2013 9:20:44 AM | GPUGRID | Requesting new tasks for NVIDIA
8/6/2013 9:21:00 AM | GPUGRID | Scheduler request completed: got 0 new tasks
8/6/2013 9:21:00 AM | GPUGRID | No tasks sent