NAV 5.0 SP1 User Role not working

I've given a user (let's call them USER 2) the same user role as someone else (let's call them USER 1).  The problem I'm having is the USER 2 can't do the same function that USER 1 can.  This shouldn't be the case if I copied all of USER 1's login roles to USER 2.  Can anyone please share on how to this can be fixed?  Thanks!