Update, I figure it out and was able to recover Panorama.
The “corrupted” preference file com.provue.PanoramaX.plist was being recovered every time I tried to open panorama.
This file was located under Library/Autosave. Once I deleted the file, I copied my backup preference file back to the Library/Preferences folder and everything went back to normal.
I’ve never looked in that folder before, but sure enough, there is a copy of Panorama’s preferences in there, as well as a few other apps preference files.