It's the calibre in the distro. I take your point, but I had no issues with the in-distro calibre, including with custom plugins, until loading KoboTouchExtended, and the error message does suggest (to my untrained eye, at least) that the problem is with this plugin.
If you can guide me to a specific issue with the in-Fedora calibre, I will happily log a bugzilla issue for that; but until then I'm unwilling to take on-board the maintenance issue of keeping my apps manually at the latest upstream versions.
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