Orcad schematic pst files empty

Customer-supplied Orcad Capture V16.3 Heirarchical schematic.

V16.3 and V16.5 schematic DRC's look good. No illegal characters that I can see, found/fixed one duplicate refdes.

 pst output files contain header info only - nothing else extracted from schematic to files

 pstchip.dat file example below. pstxnet and pstxprt files are similar.

FILE_TYPE=LIBRARY_PARTS;
{ Using PSTWRITER 16.3.0 p002Jan-16-2013 at 10:16:09}
END.

Any ideas?

 Thanks in advance