Based on the error messages I posted and this page reporting a similar error
http://www.davidchinphoto.com/snow-l...it-types-osax/ I upgraded both the Adobe Unit Types.osax and the List & Record Tools.osax to later versions.
I still get the same error using calibre but now the debug log is empty. I doubt if that will help you!
I will try a restart at some point in case anything is hanging around from the upgrades but can't do it now.