fMRIprep error during lta_concat and Freesurfer brainmask problem

Jenni, just as an update, the latest release of fmriprep should resolve your issues. You’ll need to re-run with a fresh working directory and remove the FreeSurfer derivatives, but we tested on the images you provided, so we’re reasonably confident it will work for you.

Wow, that was so fast! Thank you so much!