In checking my task list I noticed two whose status indicate "In Progress," while I know I've none running, or queued, waiting to run; the two were supposedly sent together, back on June 7th, and both have a deadline of July 30th. Each of the WUs has a quorum requirement of 2, and both have been processed and returned by the member who received the other copies.

These two WUs aren't large, so I doubt the other member will get too upset when, come July 30th, he/she loses his/her credit when I fail to return my completed copies of the quorums. But there have been times in the past where I've lost my investment in a substantially large processed WU when the other person in a quorum failed to return their results. So my questions are: 1) How is it that the server's database comes to believe that WUs have been delivered when, in fact, the "recipient" does not have a copy? And more importantly: 2) Is there a way to request a WU be resent when one that's been assigned is discovered to be missing? Thanx!

I doubt the other member will get too upset when, come July 30th, he/she loses his/her credit when I fail to return my completed copies of the quorums.

He will not lose any credit - the task will timeout and new task (same WU) will be sent to someone else (up to 10 times the WU is "tried" again)
E.g. look:
http://setiathome.berkeley.edu/workunit.php?wuid=2204611247
http://setiathome.berkeley.edu/workunit.php?wuid=2161842936
http://setiathome.berkeley.edu/workunit.php?wuid=2204614213

1) How is it that the server's database comes to believe that WUs have been delivered when, in fact, the "recipient" does not have a copy?

This is a fairly common (~2-5%) situation:
- the computer asks for work
- server sent Message back "here is your work, go and Download it"
- that Message was lost somewhere on Internet so the computer don't know it have to "go and Download it"
= web shows "In Progress" (at the moment "server sent Message back") but the tasks are not really Downloaded (which is the second phase of "get tasks")

These tasks are called ghosts

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- ALF - "Find out what you don't do well ..... then don't do it!" :)
 

If you return your results in time you will get whatever credit is appropriate after validation. If a wingman fails to return a task, then it is sent out to someone else, and all that happens is the validation process takes a bit more time.

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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?