First, I love this plugin. It's great and does the job perfectly. However, it causes the Pages and Templates tabs of the Headway Editor to display "0" rather than the list of pages and templates to edit. I came across it and spent some time confirming the problem. I contacted Headway's support and they directed me to the developer. Here is the response I got from Headway:
Look for an alternative plugin, or try contact the developer of that plugin if you need support for it.
If they believe believe that there's something in Headway that needs to be changed to improve compatibility, pleases get them to contact us.