I think these bandes are coming from one of your clouds layer. Try to check them. The other thing that can make this kind of things could be volume lights but I think there is none in your animation... The last thing I can say is that you can eventually contact me via instant message. I'll send you my e-mail adress so you can send me your Vue file for I can try to find the problem... Hope it can help ! Argentium Thri'ile