I'm having this same issue. I have deleted all mods. and tried starting a unmodded game. I have Uninstalled skyrim and reinstalled from a disc. still stuck in this stiff arms to the side legs apart posture. I updated all mods, and went through uninstalled the ones i wasn't using anymore (properly as far as the mod pages said to) and the issue started occurring. and it occurs whether i have mods on my game or not. Everything is up to date on the mods list, and NMM is up to date also. Could it be in Updating my mods that by doing so without realizing it, I broke the script of skyrim for movement animations?
