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Hello everyone, I am a master student using fsl for the first time, so I have some questions that might seem trivial. I ran a comparison between two groups (patients and controls) using a two-sample unpaired T-test, and it worked fine. This was my command: randomise -i /media/fmriDATA_4/Darko/everyone_lHC.nii -o /media/fmriDATA_4/Darko/lHC_test -d /media/fmriDATA_4/Darko.mat -t /media/fmriDATA_4/Darko.con -T My mentor suggested to include a gray matter mask, in order to reduce the number of voxels being included in the comparison. I then made this command: randomise -i /media/fmriDATA_4/Darko/everyone_lHC.nii -o /media/fmriDATA_4/Darko/lHC_gmm -d /media/fmriDATA_4/Darko.mat -t /media/fmriDATA_4/Darko.con -m /media/fmriDATA_4/Darko/masks_HC/mask_j_3.nii -T but the terminal just remained silent and never started any permutation or anything. It seems that the addition of the mask somehow glitched it, but when I open the mask file in FSLview, it shows a pretty straightforward image of gray matter, so it looks fine. Do you maybe have any idea of what might be wrong? Thank you in advance! Best regards, Darko