No, it’s not just you. It looks like popular Bitcoin exchange Mt.Gox has been having performance issues today. It’s unclear as to what the issue is this time around, and the company has yet to post any relevant information regarding the outage on their official Twitter account.
At this point it seems flaky, but upon my visiting the website a few moments ago, I received the ‘bad gateway’ notice from their web server. More information as it becomes available.