Hi Richard
You have your NFR GP Power Tools install to help you.
While logged on as 'sa'.
Open the Security Profiler and click on the Customize this page link.

This tells us that the window you need is Customize Home Page (syHomePageMain).
Click on the window and click the Security button to open Security Information.
On the Security Information window expand the system level.

This tells us that the DEFAULTUSER Task is required. This task is added to all default Security Roles, so access to any default Security Role should give you access.
If you have created your own roles, be sure to add the DEFAULTUSER Task to those roles. This gives access to all the lookups and standard windows that all users need access to.
If you want to know exactly what is in DEFAULTUSER Task, change the right hand pane to View by Security Task (System Level), Select DEFAULTTASK on the right hand pane and then click Show Resources.

On the Security Information Resources window, click on the checkboxes to change the selected resources.
Regards
David