Philip,
I had the same issue and registered my problem with Infusionsoft as they are the authors of version 1.3.
They have not updated the plugin to fix this issue.
The only workaround I found was to go back to version 1.1 which seemed to work fine.
I am an Infusionsoft Certified Partner, but certainly not a coder so I don’t have a clue on how to edit or repair Version 1.3.
My suggestion is to register a complaint with Infusionsoft and see if you get a different response that what i received.
Good luck,
Ed