This bug has appeared on sparc and x86 for me. The default install of 6.0 with Netscape, trying to use Java causes Netscape to die a horrible death (bus error). It seems that it is croaking in "GetFontList", and by reconfiguring xfs to look at all the available fonts that are installed (including the ones in /var/share/fonts/default) it fixes it. It shouldn't die getting a list of fonts. I suspect that it tried to get a list of specific fonts and couldn't get any, and got a NULL list back, and it croaked becaues it doesn't check for NULLs. But that is just my suspicion.
*** This bug has been marked as a duplicate of 2711 ***