Odd, everyone else worked fine with everyone in Welcome. Just note that the circle will not show up on you, but it will show up for anyone else as I said in the release notes.
Anyway updated it again with Menu Item. This one works for me and everyone else http://www.norteclabs.com/HF/scripts/utility/AvatarFollowerUI.js?12312387
You can now use the hot key U to toggle it on / off, and you can find the hotkey item in View > Avatar Follower UI