I am having this same problem, just as of yesterday. Was dancing in a club, selected "stop animating avatar" and went home. In home i cannot move avi, only can turn around, can fly upwards only. I'm using Firestrom Phoenix. I've checked the movelock, i've logged in and out at least ten times. i have a locked collar i cannot remove. Is it something with that? No other programs are running on the computer, i've run virus scans, etc. Very sad here.