DO you have apptrap buy any chance?
Put the following in the trash..
~/Library/Preferences/calibre
~/Library/Preferences/net.kovidgoyal.plist
Then run it again... I'm pretty sure the above is all the config. Start it again and it "should" be like you never had it. It should prompt for your library location. Just point to your current library. No need to delete that at all.
That said, I have funky issues with the columns too. Try to size/rearrange the columns where the tag column is missing. I don't know what you mean by it shows/has a "semetic" script???
BOb
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