XDIGIT display problem

Dear grass users and programmers:

When I run xdigit session I couldn't see anything displayed on its graphic
window. However, if I save the edited version of the map, I could
display it correctly with d.vect. Anybody there has faced this problem
before? Or any expert knows how to fix it, Please let me know.
I'll very appreciate.

        Thank you in advance

        PK Lin
        E-mail: pklin@cerf.net
        Tel: (617)942-1655