If the unset panel config command doesn't work, try this one:
gconftool-2 --recursive-unset /apps/avant-window-navigator
If that doesn't work, then I'm currently out of ideas.
If the unset panel config command doesn't work, try this one:
gconftool-2 --recursive-unset /apps/avant- window- navigator
If that doesn't work, then I'm currently out of ideas.