In case anyone else is interested, here’s the response someone offered on another forum:
“Double clicking an item in the Project Panel simply opens it in the Source Monitor for preview. Same as when you match frame (F) a clip from the timeline. By contrast, double clicking an item in a timeline opens it in the Source Monitor and creates a dynamic link to the timeline – if you now change In/Out points in the Source Monitor, they will update in the timeline. The frame your playhead was over when you double clicked on the clip will be the frame the clip starts from when it’s in the Source Monitor (if your playhead wasn’t over the clip at the time then the start frame will be the one you double clicked on).”
That makes sense–I’ll have explore when I check in to the project. I think I’ve been double clicking without the playhead positioned on the clip in the timeline. So I’ve been getting the entire “master clip” and not the edited portion. Also sounds like I need to do the trimming I want on the timeline, since changing Ins/Outs in the Source Monitor will redefine the subclip, not just edit the timeline instance.
Robert Withers
Independent/personal/avant-garde cinema, New York City