I checked the archive for any pointers about specific use instructions for EasyReg and read the wiki page. 
I would like to register three T1w acquisitions on three planes (Axial, Cor, Sagittal). 
This was my first attempt:
mri_easyreg --ref [myimageAXIAL.nii]  --flo [myimageCOR] --ref_seg [filename_tobecreate_seg_not_runpreviously]  --flo_seg /[filename_tobecreate_seg_not_runpreviously] --ref_reg /[filename_tobecreate]

The command run and did generate the segmentation files but froze here:

Deforming and writing to disk

  Computing backward field

  Deforming reference image

  Saving deformed reference image

I could not find a log file. 
Any suggestions? My plan was to use EasyReg on this registered image and register it to the Saggital acquisition, but maybe there is a way to do that registration at once?
thanks for any pointers and for putting together such amazing tools,

Fidel