stop/start syncs on a folder from nautilus stops syncs of existant files

Ubuntu One doesn't syncs existent files in this case:

1) create a test folder and put a test file there.
2) in nautilus select 'Synchronise this folder'. The folder and file is synchronised and available through the web on https://one.ubuntu.com/files
3) Select 'Stop synchronising this folder' in nautilus. This folder disappears from https://one.ubuntu.com/files.
So everything is fine at this point.

4) Select again 'Synchronise this folder'. This folder appears on the web. But empty.
__The old existent file in this folder no longer synchronised! __
All new files added to this folder synced fine and appear on the web but not the old ones.

I am on Ubuntu 11.10. Haven't used Ubuntu One so can't say if this bug was before.