A different My Documents redirection problem

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I'm having a somewhat different My Documents performance problem that I
hope someone can help with. We have SBS 2003 and three XP clients, all
running the latest and greatest. My Documents redirection is
configured and (in general) working correctly. The problem is that
after being logged in for a few hours, access to the redirected My
Documents folder gets painfully slow. ONLY for access to the top-level
My Documents folder; accessing any folder underneath is fine. If I
double-click on My Documents, the system seems to hang for 15-20
seconds, and then displays the directory listing. Here's the really
bizarre part: if I create a separate network drive also pointing to the
user's My Documents mount point on the server, everything works great.

The problem seems to have nothing to do with the contents of the top
level directory. I tried moving everything to a single subdirectory
and the problem still occurred. The problem only occurs whether I
directly access My Documents, or whether I click the up or back buttons
on a subdirectory. After a fresh reboot, no problems occur. The
previous IT guy set up redirection using a network drive letter rather
than UNCs, but I don't quite see how that could be the problem.

I'm pretty sure that I've eliminated connectivity problems as a
possible cause using a variety of methods. The network is quite simple
anyway: four computers, one switch. Of course, the fact that I can
access the directory fine by creating a new network drive would seem to
eliminate connectivity as an issue anyway. It seems to be in the
Windows directory redirection mechanism, but I have no idea how to
debug this.

Help!
-----Stuart

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