They are definitely not DRM books. These are books that are already in my calibre library and were working before.
Also I tested some more books this morning. And it is definitely the mobi files that are giving me errors and won't open. All of them.
The Error I get is, a white pop up box comes up saying. Calibre-parallel.exe has stopped working. Than it goes, check online for a solution or Close the program.
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