In the process of upgrading in Linux Mint, I've gotten a strange star-studded window with a spiraling spaceship but NO workspace options.
$ uname -a 3.1.0-1-686-pae #1 SMP Sun Dec 11 20:40:16 UTC 2011 i686 GNU/Linux
/etc/lsb-base yields the distribution as:
debian "Linux Mint Xfce Edition".
In Linux desktops, I have formerly been able to request a workspace manager via a right click in the lower or upper border. Now I get no response to a right click in any location!