So Tyson and Tim have just got back from Malawi. We took out 5 Raspberry Pi computers for a new library that has been built in a school in Chigonere village.
One of the choices we made when designing the Pi set ups was to boot the OS from a USB stick rather than a partitioned SD card (see here for more on this).
Now on a couple of the Pi we had an issue during the week where the menu bar just vanished. With a bit of googling around (see this page for more) we figured out a solution:
$ sudo rm -r .config/lxpanel
This deletes the existing user lxpanel config file and then restarts the x session, which then creates a fresh (and working) lxpanel config file. Job done!