I don't really know the answer (obviously...you know WAY more than me about SKS6), but maybe I could check whatever skin it is your having problems with on my computer, to see if it's happening on all computers or just yours. Also, do you have Windowblinds 7 installed (if you do, might that be interfering with your animation?)
I'll open up MSM messenger if you want to IM me and have me check out whatever skin you're having a problem with on my computer (dinasaur that it is, LOL)