Quote:
Originally Posted by DNSB
4.23 is capable of using a calibre 5 database file, calibre 4.08 is not capable of doing so. An upgrade to 4.23 should not cause any issues with your plugins.
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Thank you - I didn't realize 4.8 was earlier than 4.23.

I've downloaded 4.23 and all is working as expected.
Thanks everyone for your help!