Well, Eureka, or should I say Duh…. I discovered that the audio sync problem disappeared when I unchecked the Advanced Pulldown option (listed under Preferences in the gear wheel drop down window in Log and Transfer). This makes sense since the footage was shot on 24p and the sequence preset for the project is 24p. However, I don’t understand why the Easy set ups for DVCPro HD 720 24p automatically enable the advanced pulldown feature.