After dragging a clip from preview window to timeline, it is black and silent

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?

Turn off proxy and try again.

Excellent! Now I’ve got to get it to work with proxy. I’ll let you know.

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.

Thank you for the help!