Bruce,
We had previously addressed an issue with creating the bases from 5 timepoints in v5.1 where mri_robust_register failed. We were advised by Dr. Martin Reuter to either replace mri_robust_register & mri_robust_template binary with the ones from v5.3 or to run all the bases and longs in v5.3. We chose to run the longitudinal stream in v6.0 as it was released by then. If it is not safe to mix versions (cross in v5.1; base-long in v6.0), could you clarify if it is alright to just use the binaries from v5.3/v6.0?
Thank you very much, Jaiashre.