I can’t help with the specific Media Browser problems. That’s probably a technical enough detail to require assistance directly from Realmac. Even though you’ve had trouble with it in the past, I’d still recommend trying to contact them directly.
As for defaults: You can run a test to see what deleting all the prefs will do to help you decide whether it’s what you really want to do.
Create a brand new user account on your computer (just temporarily, you can delete after you test) and launch RapidWeaver in that temporary account. That new account will not have access to your current settings – it will be as if you deleted all your preferences.
If that works, and you don’t mind the hassles (re-entering serials), then perhaps deleting the prefs would be the way to go. Just know that it’s kind of the “nuclear option”.
By the way, the different versions of RapidWeaver store their prefs in different places, make sure to nuke the right one. For most users – RapidWeaver 7 downloaded and installed from the Realmac site – it’s located here:
- delete that file
- double check to make sure the file was not re-written by macOS
- launch RW
or, conversely if you feel confident in Terminal the unix command is:
% defaults delete com.realmacsoftware.rapidweaver.plist