I'm running Adobe Premiere Pro on a Mac, and after benching a project for a while and now coming back to it, some of the nested sequences will play just fine in their timeline, but show up as audio with video blacked out in the master sequence timeline.
Here is what the nested sequence looks like playing from its own timeline:
Now here is what it looks like when used in the master sequence:
Notice how it appears as all black both in the source monitor and in the program monitor.
What is this and how do I fix it?