After dragging a clip from preview window to timeline, when I play it in the timeline there is no sound and video is black. This video shows the behavior.
The track is not muted or “eye closed”. I removed all filters at track level and at master track level. What else should I check?
Now I find that whenever I drag a clip to the timeline and it can’t be seen/heard, I can turn off proxy, then turn it on again, and then the clip works correctly.