"Can't help thinking that whenever changes are made to the site, funny things happen."
Certainly makes me laugh.
It's not the changes we made, it's likely to be an advertiser who is displaying their ad on a "secure" page (https) rather than the current standard of
http. This is confusing the browser a bit. We do try and stop them doing this, but it is trick when there's so many to rein in - it is a nuisance rather than a danger for the most part.
Are you still getting it today?