I work at Google but not on this product.. so I escalated your issue to the team that works on the anti-phishing classifier. They're looking into it now, and put you on a temporary whitelist in the mean time (should take effect within 30 mins).
Just one more thing. Since our product is self-hosted by our customers under their own domain, white listing just our development domain is unlikely to help our cause.
I believe they actually whitelisted/disabled the part of the classifier that is affecting your site(s) more-generally, so it should be working across all domains. That said I know very little about the internals of that system.
I'm sure they will contact you via regular customer support channels (ie. not HN) if they need any more info to debug the problem.