Description of problem: on specific combinations of preferences. Fixed by http://svn.gnome.org/viewvc/gnome-games?view=revision&sortby=date&revision=6829 Version-Release number of selected component (if applicable): gnome-games-2.20.0.1-1.fc8
Note to other gnome-games maintainers, I'm handling this.
2.20.0.1-2, which includes the patch fixing this, is building now.