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The URL looks to be proper but so I am not sure what is causing the security threats. I just loaded my own form in a few different browsers without issue. When I checked one of the forms in your account, I was also unable to reproduce the security errors.
Try clearing your browsers cache/cookies then logging back in to to see if that helps. Log in from our base domain:
If that doesn't work, try a different web browser to see if the same thing occurs. If it still does, let us know and we will be happy to have another look.