Forcecommand is giving strange results with Tmux

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http://serverfault.com – I'm trying to set up pairing with tmux (wemux specifically). I have a pair user set up on my system and can ssh into pair and attach to a tmux session manually. However when I set up Forcecommand in the Match block to attach to tmux automatically on login, it fails saying that there is no tmux session to attach to. Permissions are set to 777 on the socket. I'm on OsX mountain lion, if that helps. Any ideas? (HowTos)