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I have applied a fix to you form.
Can you please test again and let me know if the problem persists?
It did not fix the problem. I still get the same error.
Sorry about that, it should be fixed by now.
FYI, you are using a custom template in which the background image (blue envelope) is served on http. This is the reason why the security message appears in the browser. Anyway, I have re-uploaded the background image to your form and used its secure URL as your form background. You can check the background image URL when you view the injected CSS codes on your form. http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes