What is happening is, when I arrive at certain sims, my avi's legs will begin shuffling a little after I have walked around and stopped. Sometimes while standing, my avi will just start to either fall through the floor, or start to drift up. This started happening to me a couple of weeks ago. I use the new version of Phoenix and I have an AO from VISTA Animations. I have taken the AO off and the same thing occurs, so I know it is not the AO. As the person who answered below, the possibility that it is the lag is there. Sometimes, the longer I am in the sim, it will eventually go away, but this never happened before until recently. But I have gone to sims that I know are heavy with lag and had no issues. It is just weird to me is all.