@Mr Goodbar and @weyns1960 please can you raise this bug in the IOS reader plugin thread (
https://www.mobileread.com/forums/sho...d.php?t=241143), as that is probably closest to where the problem is. I have a theory as to what the problem is, but we need more evidence, especially the debug log. I have no idea what the ConfigWidget error is-- but seems like a problem with the Calibre installation.