I set my in and out points in the source monitor and edit them into my sequence. In the sequence, the clip now starts a frame too early every time. This only happens when the frame rates mismatch, but it happens every time.

So I have to either slip it back a frame, or remember to always mark in a frame late. This is particularly irritating when I'm working with shots from a pre-cut video because it introduces flash frames if I intended to start from the first frame of a shot.