I am capturing SD from the HV20 but when I do this (into vegas and scenalyzer) using scene detection it always includes a few frames from the end of the previous shot in the new shot. I have DV locked as output. Any ideas to avoid this?

This is a fault with Vegas (7) when capturing HDV footage. I didn't know it occurred when captured DV.

Anyway, check out this thread on the official Vegas forum:
Sony Creative Software - Forums - Vegas Pro - Video Messages (http://www.sonycreativesoftware.com/forums/ShowMessage.asp?ForumID=4&MessageID=609621)

Ken