MacGRASS difficulties

  I would appreciate any help or suggestions on successfully
  running Gcontour.surf and Gwatershed using MacGRASS 3.1
  We have tried troubleshooting using the manual but the
  programs still do not work. Do other MacGRASS users
  have difficulties with these programs? I would appreciate
  any insights or ideas. Thank you.
  Pamela
  pamela@magellan.ae.utexas.edu