Does the /usr/X11R6 folder exist? Its should have been created when you reinstalled XQuartz. If it’s not there, you can try creating a link with: sudo ln -s /opt/X11 /usr/X11R6 If this gives an error then you are still in rootless mode. If it successfully creates the /usr/X11R6 link, then fslview should then work properly. keith > On Oct 4, 2015, at 7:36 PM, Gregg DiGirolamo <[log in to unmask]> wrote: > > Thanks for the information, Keith. I tried what you suggested (rebooting out of rootless and reinstalling xQuartz) and continue to get same error message.... > > Any other suggestions anyone? >