I'm on Mac using Safari, and today when i come to the site i get a warning about the site having some problems "Fraudulant Site Warning". Like malware or virus, it's a new feature in safari from Google.
Though the OP could have taken 2 seconds to see there's already two other threads on this issue.
@ OP if its an annoyance just turn it off under Preference -> Security. Jon has the issue taken care of but its gona take a couple days for Google to mark it safe again.
I saw this today too when I got on at school. It was on a Mac, using Firefox. Also, I had Avast popup in the corner saying there was something on the site, but it's not doing it anymore.