I have this weird phenomenon with one of my characters.
Walking up to Paarthunax for the first time, there is a place where an Ice Wraith skeleton, complete with damp, appears under my characters feet, and there is no way to avoid it, nor a way to get rid of it.
I noticed it, and traced it back to where it started: just after the bridge where the first Ice wraith appears.
Even mounted, it still finds me, and sticks to me.
I tried several things that did not work, even jump of the mountain. (see screenshots)
The only thing i did not try is fast travel somewhere else, and start the quest new.
I will do that, and report here later if that worked.
http://i65.photobucket.com/albums/h204/Monkey999999999999999/ScreenShot30.png
http://i65.photobucket.com/albums/h204/Monkey999999999999999/ScreenShot31.png