There is a menu I've designated as the root menu in the single VTS in the DVD. Pressing a button in a menu that calls the root menu does NOT call the root menu even though that root menu exists. Pressing that same button to call the root menu DOES call the root menu when I am in any menu OTHER than the special features one.

What are 'PUOps', how might they inhibit the operation of remote buttons and how to I find them?

I still suspect that something was done by DVD Architect to disrupt the navigation of the menu when I redisigned it.