Did you just install or update XQuartz? This might be a “first
time running it” issue. I would not expect you to need to start
XQuartz again (i.e. running afni or a related program should
start it automatically). Or maybe that requires a reboot, I am
not sure.
The
National Institute of Mental Health (NIMH) is part of the National Institutes of
Health (NIH), a component of the U.S. Department of Health and Human
Services.