No messages or dropbox and I back up my metadata nightly. The only "new" additions are some regrex expressions for importing books and I installed 3 new plugins. Goodreads metadata and covers and book sync. I removed book sync immediately after my database froze. But, since then I am having trouble with ALL libraries. I just repaired Calibre and am using a restored backup version to test.
I agree it is strange that I seem to encounter "locked" databases often.
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