Thanks for your replies!
Yes, I am using Firestorm however my avie is perfectly rezzed, nothing blurry nor cloud like unfortunately! But thank you very much for your help
No, I'm not using any sort of physics layer at all, even when my avie is stripped of everything completely the problem persists.
Not only that, I've noticed it on OTHER avatars now!
To see if you notice it, cam in on an avatars behind, look around the thigh area and you will see a slight throbbing movement.