Seems like a lot of people are having an issue logging into chat since we updated. Here is what you need to do: Logout of the chat and forums, clear your cache and cookies. Log back in to the forum, then login to the chat with the same user/pass you use for the forums.
Since this is a busy forum and some posts may get overlooked, I'd like to ask everyone to post any chat issues to this thread located at the bottom of the home page in the Chat FAQ forum. Live Chat Thread
Thank You