Unable to use chat in all games, please help

When I press enter in order to access the chat, the box does not show up, nor does it even appear throughout the game. When I press enter, the keyboard stops working for me, but when I press it again, my keyboard works again, implying that I can still use the chat. I am capable of /ff'ing through chat. This is concerning. I have tried reinstalling, changing key bindings, restarting the game, but nothing seems to work. Please help.