SEC7112 "blocked due to mime type mismatch" using .ajax post with a jsonp datatype

SEC7112 "blocked due to mime type mismatch" using .ajax post with a jsonp datatype

using
jQuery v1.11.3

Problem:

trying to post form data with jquery ajax using jsonp.  I'm sending json object containing form data to a third party.  What comes back in the response is NOT json, rather HTML.  I have no control over what is coming back.  This is throwing a SEC7112 error.  On firefox and some other browers, .always() will fire no problem regardless of SEC7112.  But in IE, chrome, the process is halted before .always() can be fired.  This applies to .done() and .fail() as well.

Anyone know any work arounds?!  Fortunately, I don't lose the posted data.  Everything goes through fine.  However, this is not a very good user experience.  All I want to do is know when the submission is finished so I can pop up a thank you page.

Thoughts anyone?

Thanks!