I have it on iTunes also. While I don't have the sync issue, I will say that for whatever reason it is definitely one of the more "stuttery" iTunes movies/concerts/whatever that I have. I don't know what that is, I even got the SD version and would have expected it to play without any issues.
Maybe there was a general QC issue when they put it on the iTunes servers to begin with? I don't know for sure, sorry.