I put a video into my timeline, but I can't see it, nor hear it

I tried to go to properties to see what’s going on, but when I click on properties, it just doesn’t budge. Also, I was foolish enough to open the video file with VLC, but now, I can’t change it back. I am getting of topic, but can somebody please help?

I think Shotuct is hung/stuck. You should kill it in Task Manager and restart it.