It's fixed now. I didn't have mumo running.
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Something is wrong with my server's mumble. If someone joins the server they are assigned to the lobby and muted. No one can talk. If you join a squad you are not automatically moved to it.
From the logs:
<W>2013-08-11 01:04:44.185 1 => <15:farooqaaa(1)> farooqaaa not allowed to Enter in Team 1
<W>2013-08-11 01:04:45.601 1 => <15:farooqaaa(1)> farooqaaa not allowed to Enter in Squad 4