All fixed - thanks.
First of all, I checked the epubcheck.json file and found 'is32bit' set to 'false'. This seemed entirely normal to me because I hadn't knowingly used any 32-bit stuff for years.
Then I set it to 'true' and tested an epub file. Epubcheck worked fine - no errors. Reset it to 'false'.
I then deleted java from the PC and reloaded 64-bit java from java.com.
Retested Sigil and epubcheck. All ok.
Quote:
Originally posted by DiapDealer: Your upgrade to Windows 11 more than likely included an upgrade to the pre-existing (and likely non-problematic) 32-bit java, and that's what caused your problem.
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I guess that's what happened. After the W11 upgrade, Java announced it needed to update and I suppose, having found a 32-bit version, it fetched me the latest 32-bit version.
Thankyou Microsoft