Thank you for the explanation BetterRed,
I followed your instructions (nice and easy to follow, excellent!).
Rebooted the computer, opened a pdf file and then closed it.
Started Calibre..it imported the pdf i had just opened.
I think I'll just have to live with this until i do a fresh install of win 11.
It's one of those unknowns. Like your nut.
Thanks for your efforts.
Cheers
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