VisualForce Page Access
In order to use the Visualforce pages associated with custom FinancialForce PSA objects, you must ensure that all Visualforce pages are enabled on all relevant profiles.
- From Setup, click Manage Users | Profiles.
- Click the name of the Standard User profile.
- Click Visualforce Page Access.
- Click Edit.
- Enable access to all PSA Core and PS Enterprise Visualforce pages.
- Click Save.
- Repeat for all other relevant profiles.
See the Salesforce Help for more information.