When I try to use the builder I can drag but not drop elements from the builder menu.
I’m working within a custom theme that someone else built. I’ve done the plugin deactivation and the problem persisted. I switched themes to 2011 and the problem was resolved. So I know the issue is in the theme somewhere.
The issue you have is that your theme doesn’t use the WordPress function the_content() in a loop which is required to use Beaver Builder.
To resolve your issue, you’re going to want to speak to your theme author and ask them to create a template including this. Then you can set that template to your page and use Beaver Builder.
This is an example of the_content() function in a loop.