I work with XDCAM EX footage and I am getting glitches on most of my footage on Premiere Pro CC. None of the footage had problems in CS6. This is a bug on CC affecting XDCAM and XDCAM EX footage.
Most clips play with artifacts / glitches on the few first frames of playback. Then audi goes out of sync. Some times I get a green screen instead of footage. In the browser some clips show thumbnails with the glitch and some show green.
I will do a clean reinstall of everything and will report if that solves the problems.