Some further oddities about my xfce-4.2.2 installation on Slackware:-
The background doesn't cover all the background if you see what I mean. I have the background set to blue but the top cm. or so of the background is pale grey.
Middle mouse button click on the background does bring up a menu, it's a menu of applications to go to, not one I've ever used.
When I right click on the funny (not very useful) thing in the bottom right corner and select 'Properties' I get an error saying 'Xfce Settings Manager error: No such plugin "xfibx"'.
Similarly when I right click on the task bar and select Properties I get a similar error saying 'Xfce Settings Manager error: No such plugin "xfce"'
Why am I getting all these missing plugins?