I have been also experiencing problem that freeview froze when I tried to select and open a new volume file.

This started after I upgraded mac OS X to Catalina. Until that I have been using freeview fine for five years.

Error message said

Last login: Thu Jan 23 13:43:03 on ttys000

[tup09900bj11:~] tomotarui% setenv FREESURFER_HOME /Applications/freesurfer

[tup09900bj11:~] tomotarui% source $FREESURFER_HOME/SetUpFreeSurfer.csh

-------- freesurfer-Darwin-OSX-stable-pub-v6.0.0-2beb96c --------

Setting up environment for FreeSurfer/FS-FAST (and FSL)

FREESURFER_HOME   /Applications/freesurfer

FSFAST_HOME       /Applications/freesurfer/fsfast

FSF_OUTPUT_FORMAT nii.gz

SUBJECTS_DIR      /Applications/freesurfer/subjects

MNI_DIR           /Applications/freesurfer/mni

FSL_DIR           /usr/local/fsl

[tup09900bj11:~] tomotarui% freeview

2020-01-23 13:54:35.305 Freeview[3205:65482] modalSession has been exited prematurely - check for a reentrant call to endModalSession:

I do have read permissions for those volume files when I checked with ls -l and mri_info.

I have tried cleaned up and reinstall freesurfer, which did not solve the problem.

It may be unique to my computer, but I would appreciate very much for any recommendation.

Tomo

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