[Freesurfer] sheered CT in tkregister2

Hi Freesurfers,

I am trying to coregister with a high-res CT, but for some reason am getting a very sheered image when I am in tkregister. Should I use another CT? Thank you!

1) MG93 2)tkregister2 --s MG93_SurferOutput --mov ct.mgz --reg spm.reg.dat --surf orig 3) no error message, just a sheered image

FREESURFER_HOME: /usr/local/freesurfer/stable5_3_0

'build-stamp.txt file does not exist! This appears to be a very old version of FreeSurfer!

RedHat release: CentOS release 6.7 (Final)

Kernel info: Linux 2.6.32-573.3.1.el6.x86_64 x86_64

NMR Center info (/space/freesurfer exists):

machine: huygens

SUBJECTS_DIR: /autofs/space/huygens_001/users/mia/subjects

PWD: /autofs/space/huygens_001/users/mia/subjects/MG93_SurferOutput/mri

ssh huygens setenv SUBJECTS_DIR /autofs/space/huygens_001/users/mia/subjects cd /autofs/space/huygens_001/users/mia/subjects/MG93_SurferOutput/mri