Bruce,
I worked my way backwards through the stream on each .mgz file. The aseg.mgz (and aseg.auto.mgz) file came up in pieces, some parts were there, others weren't; brain.mgz was blank, there was nothing there, as well as the values being 0; the same for norm.mgz. However, both brainmask & nu.mgz appeared normal, which makes me suspect the talairach.lta file. Is this bad output because of the talairach registration?
-Derin