resetting preferences in 7.0.1 rc4 (Windows 7)

[Bernard Devlin]

RC4 is loading (every time) as Motif appearance on Windows 7.  Resetting
this through the menu takes effect for that session, but on restarting,
this preference is not saved.

Deleting the stacks here:

C:\Users\<<User>>\AppData\Roaming\RunRev\Preferences

just results in a new Livecode7 stack being created there.  But still
changes to preferences are not saved to it.

Does anyone know where Livecode is getting these preferences from?

Bernard