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MATLAB and X11 errors

Hello X11 users,

I am investigating what might be causing a number of new X11 errors affecting some MATLAB users on Leopard.  The main symptom is that the user cannot connect with X11, which effectively disables the GUI.

Here are two examples.  The first is found in this Terminal output when trying to start MATLAB from the command line:

bash-3.2$ cd /Applications/MATLAB_R2007b/bin 
bash-3.2$ ./matlab 
_X11TransSocketINETConnect() can't get address for /tmp/launch-naI09R/:6000: nodename nor servname provided, or not known 
_X11TransSocketINETConnect() can't get address for /tmp/launch-naI09R/:6000: nodename nor servname provided, or not known 
Warning: Unable to open display '/tmp/launch-naI09R/:0'.  You will not be able to display graphics on the screen. 

This customer was able to work around the problem by defining DISPLAY as :0, but that is clearly not the right workaround, as customers should not need to be redefining DISPLAY.

The second example is a customer receiving this in the Console:

1/28/08 6:41:52 PM org.x.X11[202] TransformProcessType: Success 
1/28/08 6:41:52 PM org.x.X11[202] Launchd command line argument noticed. 
1/28/08 6:41:52 PM org.x.X11[202] X11.app starting: 
1/28/08 6:41:52 PM org.x.X11[202] X.org Release 7.2 
1/28/08 6:41:52 PM org.x.X11[202] X.Org Xquartz X Server 1.3.0-apple5 
1/28/08 6:41:52 PM org.x.X11[202] Build Date: 20071210 
1/28/08 6:41:52 PM org.x.X11[202] Xquartz: run by launchd for fd 0 
1/28/08 6:41:52 PM org.x.X11[202] _XSERVTransmkdir: ERROR: euid != 0,directory /tmp/.X11-unix will not be created. 

The customer is otherwise able to use X11 (xlogo works).  Any tips or pointers on how to help customers with X11 issues would be greatly appreciated.  Thanks,

- Brian
  Mac Developer
  The MathWorks, Inc.
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