This machine (http://milkyway.cs.rpi.edu/milkyway/results.php?hostid=314881) is showing 250+ 'in progress' WU's going back several days when in fact it has only 13. I tried resetting the project but the problem has not gone away.

Any ideas?

EDIT: I detached from the project entirely and this solved the problem. But there are now 256 abandoned tasks listed that were apparently never present on the machine to begin with.

If it is running fine now then you don't need to worry the other tasks will get resent eventually.

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Doesn't expecting the unexpected make the unexpected the expected?
If it makes sense, DON'T do it.

Except I've never seen this before. What caused it? One is reminded of the WU gobblers who had thousands of WU's 'in progress' and never returned a single result.

Except I've never seen this before. What caused it? One is reminded of the WU gobblers who had thousands of WU's 'in progress' and never returned a single result.

The Server burped and thought it sent you units but it really didn't, don't worry about it.

Sometimes when there are network problems or something else the results can disappear from the BOINC manger as completed tasks but are in fact present in the scheduler request that will be sent next time the server is contacted. It's kind of dumb that things disappear from the manager before they are actually sent. If you're resetting the project those will be actually lost; that might explain what you observed.