I am having this problem too – I was capturing fine for years with Adobe Premiere 6.5… but then suddenly all my A/V captures get progressively more and more out-of-sync as they go on. Once it goes over 10 minutes, it’s noticeably, once it’s at an hour into the captured video, it’s unwatchable!
I upgraded to Premiere Pro 2.0 and the problem persists! I’ve tried capturing in both non-drop and drop-frame modes… I’ve tried 32000 and 48000 khz audio… and NOTHING works!
Strangely enough it plays back fine in Windows Media Player in perfect sync.
…But I can’t DO anything with it! As soon as I take the AVI file into Encore or Premiere, it’s out of sync again!!! It sounds like I’m not the only one… is there a reason for this?