Considering that you're quite a number of versions behind on Calibre, which has received a number of updates specific to Kobo, why not upgrade Calibre and try again...
Oops. Had I seen David's post above I wouldn't have bothered. Must have opened this a while ago and just got around to responding while looking at other threads.
Worse yet, I thought the version I had just downloaded this week was .98, not .9.8 so thought you had .91, not .9.10 . Apologies. Just kill me now.
