Computation error with S6 bucket

Well, not quite all of them :-). There was a successful GW result returned on Feb 2 and there may well have been others that have since been deleted from the online database. However, it is true that all such tasks returned since Feb 9 have been comp errors. This points to a problem on your machine that has developed since sometime before this date. Interestingly, you had a couple of successful FGRP tasks that were returned on Feb 8 and a couple more which you aborted on Feb 9 when they had already progressed well towards completion. You have aborted all FGRP tasks since then. If you don't want to do them, why not exclude them by setting your preferences to do so, rather than letting them download and then aborting them?

I only mention this because I think it gives you a clue to your problem. Unless you have been changing drivers (or other system software) it's hard to imagine the onset of this problem as being software related. Also, since FGRP tasks and BRP tasks seem to be unaffected, it's not a complete hardware failure. It's likely to be something of a more transient nature. So, a couple of questions.

1. Are you overclocking any part of your system at all?

2. When did you last check your CPU heatsink/fan for cooling efficiency?

3. Have you inspected your motherboard for signs of swollen capacitors?

4. Have you checked the fan in your PSU - also swollen caps there too?

For a quick test if the problem is heat related, remove the side of your case and point a desk fan (with a good airflow) at the CPU and see if a CPU task will now start crunching. If so, and if it will complete, you will have your answer.

If you can't pin it down to overclocking/heat issues, you should try testing/swapping your memory modules as Jord suggests. It's also useful to swap to a known good PSU if you can.

Good luck with your testing.