Freesurfer is an X windows application. You have to run it with an X server environment. For OSX, this means you have to install Apple's X11 software, run it and run Freesurfer within the xterm shell window you get there (not in Terminal where DISPLAY is not set -- though you could then set it there if you really want)

On Wed, 24 Mar 2010, Lindsay Ercole wrote:

Hello All, I am running Mac OS 10.5.8. I can set all of my environment variables and then when I enter the line for calling up a session, I get: GLUT: Fatal Error in tkmedit.bin: could not open display: localhost:0.0

I try to set this to my IP address of the computer, and I still get:

GLUT: Fatal Error in tkmedit.bin: could not open display: (my ip):0.0

FS v. 4.0.1 is what we are running. The system did an overnight automatic update, and I think this is what has now caused our display issues, since they were not presenting yesterday (or the day prior). Thanks, Lindsay