OK, I've done that. I removed the .plist and the "calibre" directory in ~/Library/Application Support, downloaded a fresh copy of Calibre and copied over a fresh copy of my pre-switch Calibre Library to ~/Documents. I deleted the old Calibre app., and moved the newer Calibre Library and the prefs to my Desktop. I put ".old" on the end of the .plist, just in case.
Calibre started up and asked me what language I wanted to use, and where my new or previous library was. It had already located ~/Documents/Calibre Library (the fresh copy of my pre-switch library), but the Continue and Go Back buttons were greyed out. When I chose another folder on the Desktop, the buttons became active, but of course that isn't what I want. I explicitly chose ~/Documents/Calibre Library, but the buttons became greyed out again.
I checked the library's permissions, and it said "No User", so I explictly gave my current username RWX permissions and applied that to all the enclosed items. I chose that library again, but the buttons stayed greyed out.
I don't think Calibre is seeing my pre-switch library as an existing library belonging to me, because the username has changed. Would that matter, once the permissions are assigned to my username? I wonder if it has the buttons greyed out because that directory is not empty. What do you think?
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