I had similar problems here : http://paste.lisp.org/display/9267

but  am having those again.

mermaid:~ spundun$ cat ~/.xinitrc 
#!/bin/sh
. /sw/bin/init.sh
DYLD_FALLBACK_LIBRARY_PATH=: exec /sw/bin/gnome-session
mermaid:~ spundun$ startx

2005-07-28 17:12:40.064 XDarwin[1101] 
XDarwin 1.4.0

Release Date: 18 December 2003
X Protocol Version 11, Revision 0, Release 6.8.2
Build Operating System: Darwin Apple Computer, Inc.
Current Operating System: Darwin mermaid.isi.edu 8.2.0 Darwin Kernel Version 8.2.0: Fri Jun 24 17:46:54 PDT 2005; root:xnu-792.2.4.obj~3/RELEASE_PPC Power Macintosh
        Before reporting problems, check http://wiki.X.Org
        to make sure that you have the latest version.
Could not find keymapping file USA.keymapping.
Reading keymap from the system.
_XSERVTransmkdir: Owner of /tmp/.X11-unix should be set to root
Loading GLX bundle glxMesa.bundle (using Mesa)
Display mode: Full screen Quartz -- Direct Display
Screen 0 added: 1280x854 @ (0,0)
Could not init font path element /usr/X11R6/lib/X11/fonts/CID/, removing from list!
AUDIT: Thu Jul 28 17:12:40 2005: 1101 XDarwin: client 1 rejected from local host
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified


waiting for X server to begin accepting connections .
AUDIT: Thu Jul 28 17:12:43 2005: 1101 XDarwin: client 1 rejected from local host
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

..
AUDIT: Thu Jul 28 17:12:45 2005: 1101 XDarwin: client 1 rejected from local host
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

..Quitting XDarwin...

giving up.
xinit:  Connection refused (errno 61):  unable to connect to X server
xinit:  No such process (errno 3):  Server error.
mermaid:~ spundun$