Could be that the chat box at the top of your screen is too small to display even one line of chat text. Hit the "chat" key, then hover your mouse near the top of the screen and search for the bottom of the chat box. You'll know when you found it when your cursor turns into a vertical, two-headed arrow. You can then click and drag the arrow down to increase the size of the chat box. It may be possible (or necessary) to do this without hitting the "chat" key first, I don't remember exactly and I'm at my work laptop right now.
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