Various module tabs, both custom and stock, are missing from the module ribbon at the top of the interface for both admin and non admin users. I've verified the modules are enabled. Sugar Support recommended we repair roles, rebuild relationships, log out, clear browser cache and that worked the first time. I tried this fix again and it no longer works. It also doesn't fix the core issue - it just fixes the symptom. Any insight on how to permanently fix this would be appreciated.