MS Access 2003/2010 - Execute SQL SP Error

I have a stored procedure that I created for a user to use from within Microsoft Access 2010.  If I log in as "sa", I can execute the stored procedure fine.  However, if the user logs in and run the stored procedure, she gets the following error:

Reserved error (-7711); there is no message for this error.

I grant the user the ability to execute this stored procedure.  So not sure what I'm missing.  If I log onto the ODBC connection string as "sa", then it runs fine.  However, if user logs in as herself, then get the above error.  Also user can run a "Select" statement fine with the same ODBC connection string.  So I think it may be some kind of stored procedure permission.