Was using page builder with other 3rd party themes. Everything was working, until installing Corp theme. The page builder will not work anymore, the tab will not populate. If you go to theme and customize, nothing will show.
If the corp theme is deactivated, switch to another theme such as Vantage, or 3rd party theme, everything will work again.
Tried two ways of installing the Corp theme
1) direct from wordpress theme search
2) download from siteorigin, upload and install the zip
Seems to be a problem with the Corp theme