Comment 2 for bug 1155324

Hi Bojan, this sounds like the syncdaemon process is not starting up correctly. If you could please quit all processes starting with 'ubuntuone' (the easiest way to do this is reboot, or you could look in Activity Monitor), and upgrade to the currently shipping version (4.0.1, from https://one.ubuntu.com/downloads/mac/ ), and check whether or not the issue still happens for you, that would be helpful.

If you still have this problem, the best way to debug it would be by looking at the syncdaemon logs in ~/Library/Caches/ubuntuone/log/syncdaemon.log* - those do contain un-anonymized filenames, though, so if you'd rather keep that information private, contacting support via https://one.ubuntu.com/help/contact/ is a good way to do that.

Also for future reference, u1sdtool is packaged inside the app bundle.
Running it from there, eg:
Ubuntu\ One.app/Contents/Resources/U1SDTool.app/Contents/MacOS/u1sdtool --help
should work fine.

Thanks, and I hope this is useful.