I have skimmed the posts concerning this issue in the past as I did not have the problem. Now I do. I don't know if this was mentioned in previous posts or not, but the only change I have made is I started using Vegas' capture utility instead of HDV Split.
I have also noticed that I get 2 frames or so on the left hand side event from the immediate right event with 2 black frames in the middle (2 frames worth of space on the timeline). I allowed Vegas to scene detect.
The next capture I do I will use HDVSplit again and see if there is a difference.
j razz