First, let me say that I know nothing about the Elgato HD60. Here’s what I’d suggest. Import a clip into Vegas with project properties the same as your clip. If you are using Vegas Pro 13, it will ask you if you want to match clip properties. If so, enter Yes. Once on the timeline, zoom in so that you can advance frame by frame. This should tell you if you indeed have 1080 60P. If you see movement on each frame, then you have 1080 60P. If two frames are the same (duplicated) and then it moves, then the problem lies in your source clip. It is not uncommon for vendors to claim 60P, but in fact record only at 30P and simply duplicate frames. If that’s the case, I’d suggest you ask for a refund. Otherwise inside Vegas, reduce your frame rate to 29.97 and disable resample for your clip. You should see smooth playback.
wwaag