I doubt this will be seen, but I am having the same issue with the OSD not showing up on the Proceed AVP. I can route composite video input 4 (and only 4) to the main S-video or composite output but there is no menu overlay.
Alternatively, would it be possible for someone with an AVR to send a pic of the technical menu that is required to initiate a factory reset? I’ll try to do it blind.
I'd appreciate any help I can get because it is an excellent preamp and I'd hate to have to part with it.