Since you didn't give any details, i'm assuming you mean in the Chats and not forums (and since i can see what you're typing here =P )
This seems to be a common problem coming up lately. Unfortunately i've seen people post suggestions, but i've yet to see anyone post a consist solution that works.
All i can say is, make sure you're logged in. When you first open CC it defaults to the Chat, but you're a guest. So log in, then enter the chats. If you are for sure already logged in, then, umm... no idea.