I am running ZCM on Windows 2003 SP1 (fresh install). When a
user logs onto a workstation they run the ZenWorks window and get their
applications OK. After about and hour or so if I do a manual refresh
the following message is displayed

User authentication failed during a refresh. User applications will not
be available. This may occur if the users password is changed or if the
user is deleted from the user source.

I am only in testing phase at the moment and this is occuring on the
three workstations I have installed the adapative agent on. it also
happens on multiple users none of whom have changed their passdword or
been deleted from the user source. I am using eDirectory as my user
source. If the user is logged back in again the applications are
displayed OK.