Since about 8:00 am CST, I haven't been able to edit any pages. I was creating a new page for our standup and was able to create it, but once the page opened I couldn't do anything. I've tried editing other pages with a variety of created dates and it's the same experience. I also got an error when I clicked to publish a new page or publish (w/o notifying) an existing one.
I have restarted my computer and cleared my cookies/cache...and another user on my team is experiencing this as well. And I am able to edit templates and using the mobile app.