I just had a Teamviewer session with an affected user and yes, I don't know why the Addon Manager didn't start on his system. He was using Windows 7, are you using Windows 7 too ? Maybe there's something in the new version that might have broken Windows 7 compatibility somehow (although it wasn't done intentionally).
I restored the previous version on Live Update so, if you run it again, it should download the previous version of the dll, which should work on every system. I'll try to understand what the problem is, but in the meantime, you should be good to go.