Quote:
Originally Posted by juanferna
Tested with Calibre 8.4, it still occasionally has issues.
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After debugging this issue, I discovered that it's caused by using multiple threads to perform cache creation (when one thread queries the existence and size of a file that another thread is modifying).
To solve this issue, I suggest a modification like the attached.
In my case, it works fine (Calibre 8.10).