Thumbnail view panel on left side missing

Hello!

I'm using Storyline 3. A little while ago, I changed the name of one of the slides in my course in the thumbnail panel on the left side of the workspace. After I did that, the thumbnail view disappeared entirely. The panel itself is still there, but there's just a red X through it (see attached screen capture).

I closed the course and didn't save it. When I open other courses, they have the same problem.

What happened? How can I fix it? 

Thanks,

Jennifer J. Williams

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