I had a thread started a few weeks back but can not seem to find it. Anyway, The problem we have been experiencing is after installing MS03-026 on our Citrix servers we have had repeat problems with profiles not unloading. The issue has been taken to Microsoft weeks ago and they have many cases open. It seems that if you disable the windows installer service this goes away. Anonymous users are effected the most and often we will see anon users with the format anon000.servername. Microsoft is able to reproduce the problem and they are working on a fix.