I'm using Calibre 2.20, and just installed the Reading List plugin today. Everything works fine--I can add devices and lists, and add items to lists--until I close Calibre. The next time I start Calibre, the lists are gone, (both the contents and the lists themselves) and sometimes the devices are gone. Any ideas as to why this info is lost? Where is it normally saved?
Update--This may be a more general problem. I also installed the Count Pages plugin today, and I keep having to reconfigure it every time I start Calibre.
Update the second: Rolled back to 2.19, and plugins are now working fine.
I'll see if I can move this post to the general Calibre category
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Done - BR