main menu bar has gone away

[Mike McNally]

One one of my machines, the main Xfce system menu bar - the thing that
should show up when I mouse down to the bottom of the screen - is
gone. I don't have any idea how or why that'd happen; it was working
fine the other day and I haven't done anything other than (maybe)
install some Ubuntu updates.

What do I need to do in order to get it back?


-- 
Turtle, turtle, on the ground,
Pink and shiny, turn around.