After adding a handful of custom post types, as well as The Events Calendar plugin, when going to assign headers to various pages/categories/etc, the list of available pages and various content types doesn’t return valid pages and other content types.
It appears the assignment list is overloaded with too much content and the list Pro returns is being cut off.
For now, I am manually assigning Headers using code in functions.php but this is a band-aid solution, hoping you guys can take a look. Thanks!