[Freesurfer] Tkregister2 / Tksurfer / Tkmedit Won't Open

Hello freesurfers, I just ran registration of my functional images and am trying to visualize the registration for assessment. However, when I use the commands "tkregister-sess -s $SESSIONNAME -d $SESSIONDIRECTORY -fsd bold -funcstem f" or

"tkregister2 --targ T1.mgz --fstarg --s $SUBJECTID --surf --mov $FUNCTIONAL_MRI --reg $REG_DAT --plane sag --movbright $MYBRIGHTNESS"

the command gets stuck on "Opening window SUBJECT01".

I've also tried just opening tksurfer and tkmedit but the terminal produces no output/windows opening and simply freezes.

Any ideas to why this could be occurring? I've let it sit at this stage for multiple hours without anything popping up and without any errors.

Thanks!

Daniel