Hi there,
I can verify all of these, but one thing for sure, cornerstone utilizes the the_content() which is standard for Wordpress. Which only means, that your landing page or template doesn’t utilize the same the_content(), or perhaps, the output from the_content() is completely replaced by your landing page, or the shortcodes are stripped out.
I’m not sure how cornerstone should be setup other than the_content(), it’s because it’s the standard of all post types.
And upon investigation, the InboundPro uses its own editor (other than Wordpress’s standard editor) and it varies on each landing page template. Example, if you choose “Svbtle” template, it will then display two types of editor.
It will be the conversion content and the main content editor.
If you choose “Current Theme Template”, it will then display just the conversion content since the template is just a form.
In summary, you can’t use cornerstone with that setup because it’s only tied up and integrated into Wordpress’s default editor and integrated to the_content() as output. Unless they are going to change their template and output its content through the_content().
Thanks.