Here's my setup, I use Ubuntu One on Ubuntu, Android and Windows 7.
I recently updated my Ubuntu One client for Windows, don't know which exact version. And by the way, where can I check that?
It works. But the strange thing is that when I open the Ubuntu One app, I see the indication "File Sync in progress..." and it stays that way all the time.
But, it works! Also when I click the right mouse button in the notification on the Ubuntu One icon, I see the options and the menu says : "File Sync is up to date"
And it really is. I just checked it by modifying a couple of files and than logging from the Web interface. The files were synchronized.
Has anybody else come across this?