Strange problem. My same test files using AVCHD from Canon HG10 is placed on time line in Vegas. Only about 10 minutes total when all clips are added. The project plays OK in Vegas, sync is fine. However when I export to SonyAVC , about half way through, the video seems to lose frames for a second and then video sync is way off. I have tried rearranging the clips to see if one clip was corrupt or something. Does not seem to matter. Always around 4-5 mins sync gets lost somehow. Any ideas?