[Freesurfer] Talairach transform/coordinates not present in mgz files and/or not shown in tkmedit

Dear Freesurfers,

I am experiencing a strange issue when processing some, but not all, subjects with the recommended recon stream. After autorecon1, which includes Talairach registration step, I cannot see Talairach coordinates in the tkmedit interface ('none' appears in the text box where the coordinates usually are - attached screenshot). This is despite the registration step supposedly succeeding (I can view and adjust the reg with tkregister2). I think this may be causing further problems when trying to compute the forward solution in MNE (I get messages there about not being able to read the coordinate transformation). Has anyone experienced an issue like this?

Cheers, Andy