Does this mainly occur in indoor areas when your FPS are high?
If the in game VSync is turned on, it could be to do with your FPS not being in sync or something - What FPS have you set your limiter to? If you have it at 60 or 59, try 58 or lower (this seemed to fix the problem for me).
If that doesn't help, try turning up anti-aliasing to 8x and see if that helps (this will lower your FPS in indoor areas).
yes it does seem the worst in indoor areas, unfortunately for me, I maxed out my rig for skyrim, not knowing there would be these issues with FPS, so until modders come up with better ways to eat my resources I'm stuck at all max settings with room enough to spare that it messes with the game.
I have the limiter at 40 because it seemed to give the best elimination of my magic problem, Ill play with the limiter and try switching v sync off to see if I can get it going
Thanks for the help, much appreciated