I've been successfully using TRACULA for a while with different DTI images from different scanners (siemens, philips...). Now I am working with GE DTI data and whereas the trac-all -prep command went well, and $subject/dmri/dtifit_FA.nii.gz and dtifit_MD.nii.gz look fine, $subject/dmri/mni/dtifit_FA.bbr.nii.gz and all mni-space maps are empty (see pictures attached). I also attach the trac-all.log file. and bvals/bvecs that were generated by trac-all directly from the dicom images.