We use a plugin called Advanced Custom Fields in most of our WordPress work.
When we installed this plugin and added an extra field to the “Team” post type (it was an additional image upload), all of a sudden the page builder on every page would break (not show any content).
If we switch back to classic mode, all the content and shortcodes were there.
If we tried to add a new item in page builder, it seemed like it would work. But we are a bit nervous.
Any ideas why the page builder would not show any content that currently DID exist on that page, when Advanced Custom Fields is active? I turned it on and off multiple times and that did seem to be the culprit.