[BetterRed]

^-^ - we x-posted - no need to feel bad, you didn't do it, your AV vendor did it.

@MrKoffee - Ensure calibre is not blocked in your firewall, or some other component of your security infrastructure

Updates to security suites have been known to take it upon themselves to block applications, including calibre, for reasons only known to the security suite vendor. To my knowledge most of the usual suspects have done it at least once - some are serial offenders.

BR