Hi Dominic, It's not clear where FSLDIR is being reset - can you run system('/bin/sh -c "echo $FSLDIR"') in MATLAB? Kind Regards Matthew > Hi Matthew, > > It seems to be correct, the following is the FSL portion from the output > > dominic > > > FSLDIR=/home/ncnc_MEG/fsl > FSLGECUDAQ=cuda.q > FSLLOCKDIR= > FSLMACHINELIST= > FSLMULTIFILEQUIT=TRUE > FSLOUTPUTTYPE=NIFTI_GZ > FSLREMOTECALL= > FSLTCLSH=/home/ncnc_MEG/fsl/bin/fsltclsh > FSLWISH=/home/ncnc_MEG/fsl/bin/fslwish