I loaded the lh.orig cortex for fsaverage into Matlab. My colleague and I found that it actually has a duplicate point.

The index of the duplicate points are:

1
40970

I checked that both have the same vertices coordinates:

  -36.7233  -18.4039   64.3611


I'm not sure if this is intentional or not but wanted to draw the freesurfer community's attention to this in case it is a bug. Also, I believe a similar issue is present for fsaverage's lh.pial and rh.orig (I haven't checked other cortices).

Regards,

AZ