I’m running the most current version of everything from Creative Cloud. So far, I’ve had it happen when exporting to H.264 and XDCAM HD422 1080i60. The only consistent thing is that it’s in the V2 track.
I went back and rendered the spots where the problem was occurring and still got the same results. Last night, I exported directly out of Premiere instead of sending over to Media Encoder and didn’t have any problems. It’s just nice to use Media Encoder though so I can continue working on other projects in Premiere.