We've been notified about this issue and we'll take a look at it shortly.
<--- is what I saw when trying to post this post many times into http://sgforums.com/forums/2297/topics/470326
So I started a new thread without any choice.
I am facing exactly the same issue as Mad Hat in the above link from time to time. I have scanned my computer, no spywares. It warns me about the *.herokuapp.com thing
It doesn't seem good.
IE tells me: "The security certificate presented by this website was issued for a different website's address.
Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server."