That atlas is missing the center locations (see 3dinfo -atlas_points). I can add them with the following script. Try out the resulting dataset with the script and setting AFNI_ATLAS_COLORS to this "session atlas" for now ( setenv AFNI_ATLAS_COLORS TT_caez_ml_1.8 ). If it looks alright, I can update the standard distribution version. The atlas making script uses 3dCM to compute centers. Here it's using the internal center, the voxel location inside the region that is closest to the center of mass.

#!/bin/tcsh
mkdir tempml18_update
cd tempml18_update

# copy the old atlas
3dcopy ~/abin/TT_caez_ml_18+tlrc. TT_caez_ml_18_relabel.nii.gz

# get the labels by themselves
3dinfo -atlas_points ~/abin/TT_caez_ml_18+tlrc. | grep "STRUCT=" | awk -F= '{print $2}' > mllabelsonly.txt

rm ml_index_label.txt

# get the index for that label
set nl = `wc -l mllabelsonly.txt`
foreach labeli (`count 1 $nl[1]`)
set label = `head -$labeli mllabelsonly.txt|tail -1`
set index = `3dinfo -atlas_points ~/abin/TT_caez_ml_18+tlrc. | grep -A 1 "$label" | grep VAL= | awk -F= '{print $2}' | tr -d \"`
# replace the spaces with underscores
set label = `echo $label| tr " " "_"`
echo $index $label >> ml_index_label.txt
end

# make atlas
@Atlasize -lab_file ml_index_label.txt 1 0 -lab_file_delim \" \
-atlas_type S -atlas_name TT_caez_ml_1.8 \
-atlas_description "Updated Eickhoff-Zilles Macrolabel atlas" \
-dset TT_caez_ml_18_relabel.nii.gz -centers -centertype Icent -skip_novoxels

# try out the atlas in AFNI
setenv AFNI_ATLAS_COLORS TT_caez_ml_1.8
or
afni -D AFNI_ATLAS_COLORS=TT_caez_ml_1.8