Great job on the plugin!
For some reason this issue only happens to OSx Sierra version but is quite important that we fix it since it breaks the page:
Once the form is submitted it goes to a blank page that says:
{“success”:false,”error”:”There was a problem processing your submission.”
There is no validation on OSx Sierra so the form could be blank and you would still be able to submit it. I suspect this is javascript conflict related to the TinyMCE popup somehow failing on Sierra and then the JSON result being loaded as a link instead of as json request.