After updating DVDit ProHD to v. 6.4-641B03A, playback of HD video and AC3 audio on timeline, Title screen, and Simulation is 2x-3x faster than normal. How do I reset playback speed in the editor? Once the project is burned to Volume and BD disc, playback of the authored BD disk is normal. George

This is most likely a codec prob, what other apps are installed and also, do you have any beta versions installed.