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    Does your terminal app OR your window-manager/desktop-environment use Meta-Up for anything? Either of those will see, and possibly capture for their own use, all keystrokes before tmux even has a chance. Check their configurations. Commented Sep 13 at 3:06
  • @cas My window manager doesn't appear to be using that shortcut key, and the terminal doesn't either. Commented Sep 13 at 3:25
  • Confirmed with screenkey - Alt+Up is detected, but not doing anything Commented Sep 13 at 3:30
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    But what exactly was the issue? The idea something was intercepting the keystroke appeared in the very first comment, credit to @cas. Or was it about misconfigured terminal emulator? Commented Sep 14 at 7:30
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    Comments aren't answers and ideas aren't property. If I'm too slow, busy, lazy and/or disinterested to turn my comment into an answer, that's my own fault. I have no objection if someone, including the OP, uses an idea from my comment in a real answer. And this Q will hang around forever unless it gets an answer that is accepted. BTW, it's perfectly OK on this site for someone to answer their own question and accept their own answer. Commented Sep 14 at 8:30