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Robert JonesRobert Jones 

Error: Invalid Data.

Error: Invalid Data. 
Review all error messages below to correct your data.
Apex trigger RT1.UserTrigger caused an unexpected exception, contact your administrator: RT1.UserTrigger: execution of AfterUpdate caused by: System.ExternalObjectException: External Object Error: (RT1)

When I try to make a change to a user, I recieve the above alert.  Technical support reccomeded I post here for help.  
SalesFORCE_enFORCErSalesFORCE_enFORCEr
Your user trigger is failing for some reason. Can you post the code here?