Error starting graphic monitor

[Mazzanti Massimo]

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Hi,
I have just installed GRASS 4.1 on a SUN SPARC 2 running SUN OS.
When I run the module d.mon the MONITOR MENU appears; I choose the first
option (1 - start a graphic monitor); then I enter the monitor name "x0"
and the program answers:

Graphics driver [x0] is already running
ERROR - eof from graphics monitor.
Problem selecting xo. .....

Actually the x0 driver is not already running!
The complete GRASS installation were copied from another workstation
connected with NFS. We suppose that this could be a lock file problem.
All directories are owned by GRASS and permissions of the locks directory
are drwxrwxrwx.

Any ideas?

Tahnks.

Massimo Mazzanti
University of Venice (Italy)
e-mail: massimo at cidoc.iuav.unive.it