I have about 400 students trying to login this morning and about 300 of them can but about 100 of them cant, no matter whic machine they go to. While others can log into any machine. All students are in the same context, and same policy. I am running a 2008 server with zcm10 which the source is pointed to our tree and have had little issues since I installed it last July. The error the students are getting is

Full Message Policyhandlers.DLUPolicy.ErrorInEnforcement(studen ts)
Additional Information: User Creation Fails
Serverity: Error
Date: May 3, 2011 7:52:05 AM
Acknowledged Date: Date
Source: /Devices/Workstations/2020-001
Message ID: PolicyHandlers.DLUPolicy.ErrorInEnforcement
Probable Cause URL: None
Log ID:
Related Objects: /Policies/Students