The URL is http://houston.craigslist.org/. My browser is Mozilla Firefox but when responding to a link, the email automatically opens a new browser window using Microsoft Explorer. This is the first time I've had problems replying to ads on the site. The error occurred on September 4th at approximately 6 p.m. CST and continues to persist. I've tried rebooting but the issue still occurs. Upon clicking on a specific link for an advertised item, I should be brought to my email. I've also attempted responding to different ads to check if a specific link was corrupt. It is happening on any item within this URL.