Hi Jess,

Your AFNI version is 3-4 years old! This may not matter to
the problem, but it would be good to update it. If you want,
save the old version in case you want to compare any results.

Getting to your question, I gather that perhaps you have a
.HEAD file but no .BRIK file for that dataset. Because disk
space used to be very limited and expensive, when one did a
manual Talairach operation, AFNI would only write out the
.HEAD file. But you can't use only the .HEAD file for any
computations, just to view.

To write the .BRIK file, open that dataset as the underlay in
afni and:

Define Datamode -> Write: Underlay

Or you could overwrite it using adwarp, to avoid the GUI.

Is that the issue?

- rick