On various team sites occasionally we see the username stated as
(unknown) in alerts. Even in cases that if 1 users deletes 5 documents
the first deletion alert will show the username and the other 4 will
show (unkown). I am at a loss why this is happening. Below is an
except from a recent alert I recieved where the same user did all of
the document deletions.

Weekly Status Report 02-11-05.do... was added by schmoe, joe at
2/17/2005 9:21 AM.
Weekly Status Report 12-03-04.do... was deleted by (unknown) at
2/17/2005 9:21 AM.
Weekly Status Report 12-10-04.do... was deleted by (unknown) at
2/17/2005 9:21 AM.

These three alert that are on this alert summary should all say Joe
Schmoe. But the rest say (unknown). Has anyone see this or no how this
possibly could occur?