Twitter decided a while ago to cut off all access to RSS, and recently angered third party app developers by cutting off their access too. I'm not sure when my RSS feed actually stopped working because I don't visit my own website very often, but I wanted to fix it.
Happily, despite Twitter removing all references to RSS, there is still currently a way to configure an RSS feed for your site. Simply replace the "WebSolutionZ" with your own username below.
Unhappily, it appears that this method too will disappear in March 2013. C'mon Twitter, stop making things difficult for us!