Quote:
Originally Posted by BetterRed
That error (can't start worker process) is most often caused by a third party AntiVirus package - excluding the calibre install folder should fix it.
BR
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Thank you for your help BetterRed. Unfortunaltely excluding calibre install folder did not help. I did some more experiments, and what happens is in fact more tricky : Calibre is unable to properly launch the E-book viewer only when the ebook format is KEPUB, but it works perfectly fine when the format is standard EPUB...