Yes, this is a known bug in tmux 1.4, we tried to fix it in 1.4-2 but ran into issues with libevent (which are currently tracked in #609444) so we had to revert the fix.
Once #609444 is fixed in unstable, we can fix this. Thanks, -- Romain Francoise <rfranco...@debian.org> http://people.debian.org/~rfrancoise/ -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org