thanks, very helpful.
by the way, when i plug my library disk into an Intel Mac running Find Duplicates/Soundex works perfectly using both back level and current versions of calibre and the plugin.
you were right, there was something pathological about my library preferences, on an M1 mac. i couldn't even display them (to save them) using the instructions above (spinning pinwheel, intensive use of cpu time for half an hour before giving up.). Nonetheless and strangely, an intel mac running current catalina with current calibre and current plugin had no problem with the Find duplicates operation on the very same exclusions. isn't that strange?
Plugin settings aren't in Library/Application Support/. I see them in metadata_db_prefs*.json, which in my case was "only" a 57MB json file with a crapload of settings, and 21k in size after clearing the exclusions.
(It's easier to copy this file using cp than use the gui.)
thanks for your help. (i mention all these details only in case someone else runs into a similar problem.)
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