Just in case this helps - at best a clue, probably a coincidence: I have been having all sorts of problems with ubuntuone, and one of them seemed to match this bug - in fact it was the last one I'd followed up before I got it working on this machine - what 'seemed' to fix it, and also get the syncing working, was my latest remove and reinstall - only after removing and purging all the ubuntuone packages, and couchdb packages, in desperate scorched-earth mode I manually searched and removed any files on the system containing 'ubuntuone' (except icons etc.). This included a bunch of python files...unfortuntately I didn't note which. But just in case the problems I've been seeing are also other people's, and they relate to old files being left behind when they should have been removed...
Just in case this helps - at best a clue, probably a coincidence: I have been having all sorts of problems with ubuntuone, and one of them seemed to match this bug - in fact it was the last one I'd followed up before I got it working on this machine - what 'seemed' to fix it, and also get the syncing working, was my latest remove and reinstall - only after removing and purging all the ubuntuone packages, and couchdb packages, in desperate scorched-earth mode I manually searched and removed any files on the system containing 'ubuntuone' (except icons etc.). This included a bunch of python files.. .unfortuntately I didn't note which. But just in case the problems I've been seeing are also other people's, and they relate to old files being left behind when they should have been removed...