No, it didn’t have anything to do with the lumetri panel. The sequence, I think, was somehow corrupted. I tried opening a new sequence in the original project, pasting the clips, and still had issues. I was able to open an auto-save project from a day or two prior and that worked fine. So I was just going to work with that older project, but then I realized should update Premiere.
I was working with Premiere CC 2014 and so updates included updating to Premiere 2015 CC. When I did that, to open the original project it had to convert it for the new version. Perhaps in converting, the corruption was eliminated because everything worked fine with the new Premiere!
I’m still not sure what was caused the corruption… But so grateful it’s fixed now!