Cannot edit anything on live view

Hello everyone, I am a beginner on Dreamweaver, and I have purchased the Dreamweaver CC 2017 classroom in a book. I was making a practice website when all of a sudden my Dreamweaver crashed unexpectedly, when I reopened the program, I found that I could not edit my website anymore. Whenever I click on any element nothing happens, and the HUD's are all greyed out. Does anyone know what is going on and could possibly help? Thank you!

Screenshot below: Notice that the HUD for h1 is greyed out as well as everything else. I can't edit anything.