@Kovid: Peter beat me with the log. Mine was the same. I also realised I was wrong about the cause, which caused a few extra tests. Somewhere in there I also saw the error DrChiper reported when changing library while the device was connected.
Anyway, I've updated my source and run using that. Both Kobo devices are working correctly. The books are shown on the device correctly, I've sent a few books and I have changed the library a couple of times. I didn't see any errors.
I assume this means that I Kobo devices won't get the performance improvement you put in. I'll have a look at the thumbnails in the driver and see what is different.
Thanks for the quick fix.
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