Background tabs with output are highlighted wrongly in 12.04

In 11.10 and earlier, background tabs that produce output are highlighted in bold. In 12.04, they are instead highlighted in reverse-video, making them nearly indistinguishable from the foreground tab.

12.04 info:

$ lsb_release -a; byobu --version
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04 LTS
Release: 12.04
Codename: precise
byobu version 5.17
tmux 1.6

11.10 info:

$ lsb_release -a; byobu --version
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.10
Release: 11.10
Codename: oneiric
byobu version 5.18
tmux 1.5