gnuplot quits automatically



The following code comes from manuals, It works except
that the pop-up gnuplot window will quit immediately as soon as the
mouse begins to move.

So, How to prevent gnuplot from quitting?

==== code ====
-->  load(implicit_plot);
-->  implicit_plot ([y^2=x, x*y^2-3*x*y+y+x^3-x^2+x=0] , [x, 1, 10],
[y, 0, 10], [gnuplot_preamble, "set zeroaxis"]);
==============


OS information: 
openSuSE 11.4 and  
(%i7) build_info()$
Maxima version: 5.25.0
Maxima build date: 13:26 8/13/2011
Host type: i686-pc-linux-gnu
Lisp implementation type: CLISP
Lisp implementation version: 2.49 (2010-07-07) (built on build34
[127.0.0.1])



kindly regards,
xiang