https://www.dropbox.com/s/8ilrqm6wn6...ntents.js?dl=0
This also shows up. All 3 messages seem to have occurred about the time I moved my library from old to new account on same computer. I have asked Dropbox for help. I am willing to delete library and try to export/import data from old account, but am still puzzled that I cannot find any reference to Calibre in the Dropbox itself. And I am too ignorant to understand the pathways and what to do with them--or even where they are.