We ran into an issue where a valid CRM user could not run a particular report. The root cause was that the user (who is a valid CRM user) could not query data out of the Filtered Views.
Further investigation revealed that after his CRM account had been created, his domain logon name had been changed in Active Directory. However, in the SYSTEMUSERBASE table in the _MSCRM database, it was still the old login name.
By changing the login name field in the SYSTEMUSERBASE table to the new domain login name, the issue was corrected.
NOTE: take extra caution when directly modifying the CRM database. Be sure you have a backup!

Jason,
New at this, so how do I edit that SYSTEMUSERBASE table?
Thanks!
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