Xpro3-Viewfinder Selector Not Working

Help! I've spent all afternoon with the tony phillips book on xpro3 adapting the menus.

Suddenly, the Viewfinder Selector on the front of the camera is not working.
The camera stays on ERF even when the viewfinder selector is moved right and left.

I'm hoping this is a simple menu conflict.

Can anybody diagnose for me?

I don't expect to get much help at the local camera shop.

Thanks,
Bill Slavin