I upgraded to fontconfig 2.1 and gtk+ apps stopped working with a "no fonts found" messages and xterm just segfaults. I use XF4.3. using cvs patch 20021221 in gentoo over 2.1 has the same problem. I tried running xterm inside gdb and gdb seems to just freeze and do nothing. I use gentoo, but I use reasonable cflags (-march=pentium4 -O3 -pipe).
Can you try current fontconfig CVS? There were numerous bugs related to font data management in fontconfig 2.1 that have been fixed by now.
I'm going to assume this has been fixed; let me know if current CVS still has problems.
My HD died and I had to reinstall my system, and I havent seen the bug since...
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