Black Screen with Cursor or should I say, curser....

I don't know if this is a problem with :
NW Client, 4.91 SP4
ZENWorks 7
Windows XP SP3 (users are setup as Power Users, laptops set up as Administrators)
or Windows Group Policy
or ?

here's the steps:
1. image the workstation with base xp image
2. installing all the needed applications for the user
3. register the workstation in the correct context
4. submit workstation to user
5. after a couple (2-3) successful logins,
user logs in and is faced with a black screen and a cursor.

It happens to just about everyone that logs into the workstation.
Two out of ten accounts have been able to login succesfully.


any suggestions appreciated,
israel