Personalize: function not available to this responsibility. Change responsibility or contact system administrator

After Upgrade To Release 12.1.3 users receive "Function Not Available To This Responsibility" error while selecting sub menus under Dignostics

Navigation:  Help > Diagnostics > Custom Code > Personalize

Solution

1. Change the profile "Utilities : Diagnostics" to Yes at the appropriate level  (User / Responsibility).
2. Clear the cache.
3. Bounce the Apache.
4. Login and Retest the issue.