Portable reader works, main reader doesn't.
When I click on a book in installed Calibre on my PC the reader opens a transparent rectangle with the title of the book, the minimise, maximise and close controls on the top right as usual and that's it.
I have had to download portable Calibre and point .mobi etc at that to read a book having disabled all file types in Preferences on the main program.
What have done wrong? I've just updated to the latest 4.21 64-bit but it's been like that for ages.
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