This appears to be a timeout on your side not even reaching us...our traffic logs show no errors in the time period this question was posted (or any close dialog load). Are you going through a proxy, or have any other trouble reaching US sites in general?

There's no server error on our end, the next time this happens can you log the exact time (UTC) that it happens so I can look at our traffic logs? Maybe the response pattern will help us see what's happening here.