Are you behind a proxy server at work, or do you have a direct connection to the Internet? Sometimes anal-compulsive network administrators block the port it uses. Otherwise, try signing out of google altogether, then sign in again.
It’s been out all morning. I thought it was just me at first, but with it being out all morning, I thought I’d check. It usually runs fine at work, but they randomly block interesting things (and unblock them the next day) so who knows.