External Email - Use Caution

 You’re using the 7.2.0 release from 2021 whereas the latest release is 7.4.1 from 2023.   Unless you have to stick with the older release because floating point math results could differ with a newer one, then you could try downloading and installing the 7.4.1 release from the links under “7.4.1 Release” at the top of the page,

https://surfer.nmr.mgh.harvard.edu/fswiki/rel7downloadsOr try just running the subject that fails with the 7.4.1 release to see if it makes a difference. - R.