Components of the Unlimited Addons plugin are displaced to the bottom of the post draft window after the content. It also prevents the page from completely loading. This happens only when the Unlimited Addons plugin is activated. You can't really see the components in the screenshots on the normal draft page screen, but you can see in the code screenshot.

I followed the instructions on your FAQ page to add a line of code to the htaccess file and it caused an Internal Server 500 error.