Waldek:

The problem is that GPC lost track of variables. More precisely, the line (in procedure printfeature):

with f^, f^.definition^ do begin

confused GPC. As a workaround you may replace it by:

with f^ do with f^.definition^ do begin

Thank you!! I confirm that that solved the problem when I did it for all cases. Also thanks for identifying how to correct the GPC code. Tom Dr. Thomas D. Schneider National Cancer Institute Laboratory of Experimental and Computational Biology Molecular Information Theory Group Frederick, Maryland 21702-1201 toms@ncifcrf.gov permanent email: toms@alum.mit.edu (use only if first address fails) http://www.lecb.ncifcrf.gov/~toms/