["Login failed. Unable to connect to simulator" is what appears when I try to log on.]

Starting today, when I try to log on I get a prompt that states:  Login failed.  Unable to connect to simulator.  I have read what others have answered about this issue and when I logged off yesterday, I was not wearing any type of tag.  I have very few Groups that I belong to and the ones I am with I have been with them for quite a long time, so I cannot imagine that a tag I was wearing was somehow corrupt.  I use an Apple iMac and have never had any type of major issue before, so I am kind of concerned.  I do know that Rolling Restarts happend very recently and were finished yesterday.  I do hope someone can help me with this issue, I would hate to lose the one and only avatar I have had for 6 1/2 years and all the goodies that I have gotten for her.

[How do i stop my avi from "jerking" around when i stand in certain sims?]

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.

[How do i stop my avi from "jerking" around when i stand in certain sims?]

How do I stop my avi from "jerking" around, or floating away when I stand in certain sims?