Why can't I select any of the sources within my scenes?

[Chapinski]

I was working in OBS this morning, creating and duplicating scenes, creating sources, etc. Suddenly, I cannot select any of the sources in any of the scenes in this Scene Collection. I was able to open a different scene collection and select items in those scenes.

Mac OS 10.15.5.

 

[BobJ]

I am having the same issue with the Windows version. I have 7 media sources defined in my scene. I can highlight and move two of them, but I cannot highlight or move the other sources. These are defined sources, not references.