Happens for me as well on Ubuntu 16.10 after running both 'apt upgrade' and 'apt full-upgrade'.
~ uname -a Linux colin-t460 4.8.0-27-generic #29-Ubuntu SMP Thu Oct 20 21:03:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
~ byobu -v byobu version 5.112 tmux 2.2
~ zsh --version zsh 5.2 (x86_64-ubuntu-linux-gnu)
Happens for me as well on Ubuntu 16.10 after running both 'apt upgrade' and 'apt full-upgrade'.
~ uname -a
Linux colin-t460 4.8.0-27-generic #29-Ubuntu SMP Thu Oct 20 21:03:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
~ byobu -v
byobu version 5.112
tmux 2.2
~ zsh --version ubuntu- linux-gnu)
zsh 5.2 (x86_64-