Recently got this problem a few days ago also.Which browser are you using btw? I'm using Firefox and Internet Explorer! Neither works..Perhaps the one who mentioned the groups.even access the "groups" because it turns off every time turn it on! decided to change languages. I was English (Pirate) before, and I changed it to normal English--and it worked! thenreswitched it to English (Pirate) and it works still.

See and try if it works for you! When you log in facebook, scroll down to the bottom left hand of the page and temporarely change your language to something else other than your default. After that.. Try and open up chat again.. If it works, feel free to change it to another language and it should work.