Problem with graph monitor when many grass users on one computer

I have recently installed Grass4.1 on a Convex C3220.
Everything seems to work fine, except that the graphic
monitors get hung when I run whole labgroups with
10-13 X-terminals.
I tried to duplicate the XDRIVER and attach only up to 4
monitors to each copy of the driver, but unsuccessful.
Is there anybody who has experience in running simultaneous
ten grass sessions from one computer?
All suggestions are welcome.

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Hans Hauska e-mail: hans@fmi.kth.se
Div of geoinformatics voice: +46-8-790 7341
Dept of geodesy and photogrammetry fax: +46-8-790 6610
Royal Inst of Technology
S-100 44 STOCKHOLM
Sweden
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