With ubuntuone-client{,-gnome,-tools} 1.0.2-0ubuntu2, I believe I'm seeing the same/similar problem. While at work today, I used the web interface to modify a file stored on Ubuntu One. When I got home, it had not synced to my desktop which was on all day and Ubuntu One claimed "connected" and "All your files are up to date" status. The syncdaemon-exceptions.log file exists, but is empty, and my syncdaemon.log file is attached. Telling the client to disconnect and reconnect prompted a sync.
With ubuntuone- client{ ,-gnome, -tools} 1.0.2-0ubuntu2, I believe I'm seeing the same/similar problem. While at work today, I used the web interface to modify a file stored on Ubuntu One. When I got home, it had not synced to my desktop which was on all day and Ubuntu One claimed "connected" and "All your files are up to date" status. The syncdaemon- exceptions. log file exists, but is empty, and my syncdaemon.log file is attached. Telling the client to disconnect and reconnect prompted a sync.