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In order to find the books that had these errors, I retried a re-count of pages when the book still gave an error, but this time all the pages showed up immediately, whereas before the error message remained. I also discovered that a number of books that did not have any indication of a pages count in the book details view yesterday, now also had a pages count. And I discovered that, when opening a book for the first time, the calibre viewer was very fast, instead of totally sluggish. So, I assume that, due to the removal of these plugins with the syntax warnings, Calibre became much faster, not just with the viewer, but also to process the pages error. So, what I assumed to be an error yesterday, was probably Calibre taking a lot of time to process the pages count. I could not find a single book anymore that still had an error after clicking on the re-count pages option. How these plugins could impact the speed of the viewer, or the pages count, is not clear to me at all, as I know nothing about the internals of Calibre. So the problem is solved, although I still do not know how these errors occurred in the first place. Anyway, from now on, I will use the "restart in debug mode" on a regular basis, to check if any plugins might cause problems.
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