I've looked at that option, and it's not really a good
solution. First of all, setting it to read only locks
users out of changing their UI, not a good idea. Second,
once the user changes their working directory to a
project folder, any UI changes will get saved there
instead and those will not load when Pro/E is launched
again. So now you have *.ui files in the project folders
and if two users work in the same folder and change their
UI while there, the second user's file will over write
the first.
PTC simply needs to restore loading that file from the
same folders as the config.pro. But they messed up how
that is modified too, so it's clear that the programmers
in charge of this part of the software have no
understanding of how this system worked before Creo.