Found it! (while searching for summat else).
--j.
http://www.redhat.com/support/docs/gotchas/6.1/gotchas-6.1-6.html#ss6.10 :
6.10 Netscape crashes on pages containing Java pages
Problem:
Netscape keeps crashing when I reach a page with Java applets in it. I
have also noticed that some of my applications do not display fonts
correctly.
Fix:
There is a problem in one of the installation RPMs that causes many
systems to have an incomplete list of fontpaths for X to use.
To see if this is the problem you are facing, please use the command :
chkfontpath --list
You should get output that looks like the following:
Current directories in font path:
1: /usr/X11R6/lib/X11/fonts/misc:unscaled
2: /usr/X11R6/lib/X11/fonts/75dpi:unscaled
3: /usr/X11R6/lib/X11/fonts/100dpi:unscaled
4: /usr/X11R6/lib/X11/fonts/misc
5: /usr/X11R6/lib/X11/fonts/Type1
6: /usr/X11R6/lib/X11/fonts/Speedo
You should then add the 75dpi scaled font to your path list using the
command:
chkfontpath --add /usr/X11R6/lib/X11/fonts/75dpi
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