[Lines when I turn my Avatar around]

I downloaded sl recently, and when I'm turning my avatar around I keep seeing lines on the objects and stops when I don't move, it is really anoying. I have tried different viewers, and it does it with all of them.

I am using a mac, but I have windows in my other partition on the same computer, and it doesnt do it at all on windows. I have also messed with the settings, and nothing.

I use firestorm, phoneix, and sl viewer and I have the same problem with all of them...Please if anyone knows how I can get this fixed Please let me know...again this only happens under my mac partition, not with the windows partition...so Its the same hardware...Thanks