Calibre crashes often when trying to remove formats
I have a problem with Calibre 0.8.11.
Normally it works fine and does everything you ask for.
Lately however there seem to be problems if a lot of books are selected.
I added a big bunch of books and converted epub to mobi. Then I wanted to remove the epub format.
However, every time there are more than 3 or 4 books selected Calibre freezes and has to be closed forcefully.
Sometimes it just does not remove the formats (except the selected MOBI) at all, no matter if 1 book is selected or 3 ..
Any idea what the problem could be and how to fix it?
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