Issues with Codepen?

All of a sudden the display page for the code i was writing vanished. Totally blank. The code is still intact. I checked a site i built earlier today and same thing. Luckily i had already passed that test but i don’t know what to do about this latest one(Survey Page). Is this common for Codepen?

Welcome to the forums @jkanavos. I’ve never seen what you’re describing. Are you saying you could see the preview in the layout and nothing was showing or that you didn’t see the preview pane at all?
A link to your pen would be a help.
A screenshot may help us see what you’re describing though not necessarily help troubleshoot.