It's usually the startbutton that is edited to host a bunch of other buttons like Panic and Night Vision etc. Try executing the following line in the game and see if it reappears (make sure you get the caps right).
/show_window MainHUD.StartButton
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Bugrit - 64 Monk - 51 Tailor
Boznak - 64 Warden - 41 Provisioner
Founder and proud leader of: Alternate Reality
Bringing the lazy slackery back in the game.
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