I have determined that the cause of this is the X font directory changing between Xorg 6 and Xorg 7.
The previous font directories were under /usr/lib/X11/fonts (which is a symlink to /usr/lib/X11R6/lib/X11/fonts, part of x11-common), whereas in Xorg 7 they are under /usr/share/fonts/X11. Users with customised xorg.conf files will not have the font paths updated automatically during upgrade. I think it's important that this be changed or a _lot_ of users will be left out in the cold. Xorg seems to ignore paths that don't contain any fonts, so I suggest a script to add (not just replace) FontPath lines for each existing line that contains /usr/lib/X11/fonts, with that portion changed to /usr/share/fonts/X11. -Ted
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