pfil locks up X on Solaris 9

I have a fresh install of Solaris 9, fully patched.  When I install pfil
(2.1.13) and reboot, my desktop doesn't work correctly.  When I start a
terminal it opens the window but I never get the shell prompt. When I
exit CDE, I get a white screen and it just hangs.  I can still log in
via ssh and the system seems mostly normal.  I cannot reboot the machine
however, so something is still wrong with the machine.  

When I remove pfil, everything works as it should.  When I add pfil, it
behaves as above.  I went though the remove pfil, add pfil cycle 5 times
and the behavior is consistent.

I found an old post (Aug 2007) with similar problems, but there was no
resolution.
http://www.mail-archive.com/[email protected]/msg07517.html.

I'm getting ready to patch a production Solaris 9 machine, so I'll need
to be able to recompile pfil/ipfilter.  Any help tracking this down
would be greatly appreciated.