This problem would linger for a long time. I think you are right that
there is a connection to hard copy production. Earlier that day,
someone ran into another problem: they tried to get hard copy (pdf) of
a particular problem set, and the report back was that the document had
no data. I have seen this a couple of times from windows pc's.
Here is a guess. There is a bug somewhere in hard copy production,
although I don't know what combination of events trigger it. The result
(I am still guessing) is an infinite loop with the user getting a
message about no data in the hard copy (maybe because of a time out).
Meanwhile, the loop still runs in the background.
I will see if I can find a sequence of events which reliably triggers
this. Until then, it will probably be pretty hard to track down.
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