Thanks for flagging this to us @OhYouBadBadKitten - we're getting it checked out now and will be back with an update as soon as we can.

Hi again @OhYouBadBadKitten - right, we've checked things out and there's no need for concern. There was a problem with one of the links on the thread - any image coming from a domain which doesn’t have a valid SSL will trigger this message, and that was the case here.

Just for the record, SSL is a protocol for encrypting Internet traffic and verifying server identity. Any website with an HTTPS web address uses SSL/TLS. (thanks, Google)