I just updated my plugin through the WordPress interface, and my site wouldn't load at all, not even an error message. I went through FTP and deleted just the Ultimate Tag Cloud plugin, and everything was fine again. Just to test, I went through WordPress and installed a fresh copy, and my site crashed again.
I love your plugin, so I hope I can get this resolved. I don't mind going back to an older version if that's what it takes, I just don't know where to find a copy.