Weird Problem. Chat Frame Tab

Ok, I have an issue. I've effectively lost my chatframe tab. Which means, I cannot make any kind of changes on it.

I've already tried removing interface and wtf directory, and it's still not there. My next step will be to copy an older version of beta from my laptop. Not something I like to do...
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maybe your chat settings are locked or you've selected "small chat" or something like that? ... check the interface options
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Who will survive and what will be left of them?