Recently I experienced an issue where when updating my Exchange 2010 RBAC (Role Based Access Control) policies there was an issue with the anticipated outcome of running the following command:

Set-RoleAssignmentPolicy “Default Role Assignment Policy” –IsDefault

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After running the above command all Active Directory objects should be running the Default Role Assignment Policy, but in my case they were not.  The following article is one that I wrote that discusses how to validate that all of your users are running the desired Role Assignment policy.

http://blog.enowsoftware.com/solutions-engine/bid/155725/Issue-With-Assigning-Exchange-2010-Role-Assignment-Policies

Good luck and enjoy!