D_new_window clears the whole screen

When I call D_new_window to create a fraeme, when there are previously existing
frames on screen , the whole screen is blanked, not just the new frame, although the prevoius frames are still in existance.Has anyone had this problem?
Sytem is an RS6000 network running AIX.

Joe Mintz, Deopt Computer Science, Birkbeck College