When running the longitudinal pipeline for version 6, i encountered this error " TransformSample: gcam has not been inverted!; Numerical result out of range". I found a thread with similar error but the problem wasn't solved. https://mail.nmr.mgh.harvard.edu/pipermail/freesurfer/2017-April/051240.html. 

Just like the previous thread, it happens whenever I include the "-bigventricle" flag. Below is a sample of my recon-all scripts from cross-sectional to longitudinal. The error.log and recon.log files are too large to send. Thank you. 

Best, 

Paul

Cross-sectional

recon-all -s ${SUBJECTS_DIR}/$session -autorecon-all -i ${filename} -hippocampal-subfields-T1 -parallel -openmp 20 -bigventricles -3T -time

Longitudinal 

recon-all -base ${session} -tp "${tp1}" -tp "${tp2}" -all -parallel -openmp 20 -bigventricles -3T -time 

recon-all -long ${tp1} ${session} -all -parallel -openmp 20 -bigventricles -3T -time