I am getting a 504 error (gateway timeout) for the last 2 days when I try to create or edit a page with BeBuilder(muffin live builder).
Everything else seems to be working just fine.
The 500 errors are related to the server, so I suggest contacting your hosting provider to look at the logs and resolve this issue.
What you can try before doing that is to turn off all of the plugins, and check if the builder loads then.
It seems Gravity Forms was the culpret.
Thank you kindly
We recently received reports about the issue with the Gravity Forms, but for others, the BeBuilder loaded endlessly and did not show the 504 error page like in your case, and I did not assume that it could be the reason.
However, we resolved this issue, and the fix will be available in the upcoming update.