Crashes with radeon driver in Xorg 7.3

[Adam K Kirchhoff]

So I've decided to install FreeBSD on my laptop.  I've updated it to
-CURRENT (like my two desktop machines), updated the ports tree, and
installed Xorg 7.3.  All I installed first is bash, sudo, screen, and
xorg.  I set my .xinitrc file to ssh into another box and bring up
fvwm2.  This works fine.  I can even bring up an xterm (or rxvt, for
that matter).  However, every gtk2 application I try (firefox,
gnome-terminal, gkrellm2, etc.) crashes the x server.  All I get is:

Fatal server error:
Caught signal 4.  Server aborting

Konqueror starts up fine...  xmms starts up, too (so it's not affecting
gtk1 applications).

I then installed gtk from the ports tree and ran it locally (thinking it
might have to do with the fact that I was running these other
applications via ssh on the local X server). Even the simple gtk-demo
application, run locally, crashed the X server.

Any ideas?