Have you tried deleting things from your page till you work out what causes the warning? Just start with a static copy of you page, and gradually delete elements till you find the culprit. It shouldn't take long to go through through the elements of the page and work it out if this is some sort of heuristic triggered by some element on your page and not based on the domain.

Another thing it could be is if you fetch any assets at all from your domain, and the domain is blacklisted, that causes the warning regardless of the page where it is hosted.

Yeap. we are doing exactly as you said. Hopefully we can find out.

Oh! Sorry, I missed that part. So even things like http://192.168.1.19/mystuff makes Google Chrome scream? That's crazy. I can't imagine what would cause that. Wish I could help :( ...but looking forward to a blog explaining how this happened later!