afni.nimh.nih.gov

I tried your commands on dsets here, and the output *netcc files looked fine.

I don't you if perhaps there is a bad character in that D*txt file? You can check with:

file_tool -show_bad_all -infiles DKT.txt

Sidenote: this should not be included in the 3dNetCorr command:

sub.niml.lt

That option does not take an argument:

-ts_wb_strlabel  :by default, '-ts_wb_{corr,Z}' output files are named
                      using the int number of a given ROI, such as:
                        WB_Z_ROI_001+orig.
                      with this option, one can replace the int (such as
                      '001') with the string label (such as 'L-thalamus')
                      *if* one has a labeltable attached to the file.

I don't see that affecting the 3dNetCorr stuff, though.

--pt