William and Nick -- Wow what a mess!! It's a good thing that this is a rare situation. I've seen a few instances on the ASCOM help list. No one seems to know how this info gets trashed. It's disappointing because the developers of the Platform itself (the profile info is managed by a library that is part of the Platform) really try to make that bulletproof. The good news is that, once the Preferences from the Chooser are set, those settings apply to all applications that use that device.

And William, as always thank you so much for helping Nick out!