Initial testing says this version helps some issues. I was having the stutter issue with a Safari video (Vimeo player, it looked like) at http://howardcantour.com and this update stopped the stutter. The video sound stuttered and the player was not full screen.
When using full screen video in iTunes, I still experienced some effects, more like someone putting their hand over the speaker repeatedly than the stuttering – the volume seemed to fluctuate. Opened Audio Midi Setup and it was set for 24 bit, so I set it back to 32bit and the effect stopped. Then set it back to 24 bit and the effect was still gone.