Hit Shift+F5, wait 2 seconds, and repeat until you see your status bar come back. This will cycle through prepackaged status lines in
For me, 2 out of 3 status lines were too wide for my terminal, which was 80 columns wide. When the content is too wide, the status bar just doesn't display at all.
You could also edit
~/.byobu/status, go to the line
tmux_right="#foo bar baz" and put
# in front of things like
baz, save the file, wait, and the status bar will refresh. What you're doing is disabling the display of those options until the line is narrow enough to fit in your terminal.
Control+Shift+F5 will change the color of the status bar. I also thought it stopped the status bar from displaying, but I think this is because of the delay between pressing it and the effect. One handy thing you can do is use a different color for servers.
All of this info I got from kirkland in #byobu on freenode