Platform: CS6 version 6.0.3 on Windows 7. Encoding 3840 x 2160 DPX to MP4 high using x264 Pro encoder. Audio source is 48khz wave. Playing back the encoded mp4 file from the time line results in the audio dropping out at 30.00 seconds. This does not happen with CS6 version 6.0.1. Quick Time will play back the same mp4 file just fine. What gives?
Wait, you're bringing the exported MP4 back into PP?