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user_id=6405

anydbm means the journals are stored in a separate dbm file (and the journal 
holds the creator information). If the journal entry for issue 37 got deleted, 
then accesses to the journal entry would fail as you've demonstrated 
above. Stuffed if I know why the journal entry would be deleted - there's no 
code in Roundup to do that. I can only suspect that a write to the journal 
failed mid-way through an update. This is the first occurance of such a 
thing happening that I can recall. Definitely bad though. Are the 
permissions of the files in your tracker's db directory all the same? 
 
To migrate to a new backend, you would do the export and import (I've 
done it a few times myself ;)