problems with proportional plots



David Billinghurst's below information allows me to bring up a plot in Gnuplot 4.4.2, but something isn't working correctly because when I close out the Gnuplot window, wgnuplot.exe is still running, which prevents Maxima from responding until I end the wgnuplot.exe process using Ctrl+Alt+Delete > Windows Task Manager > Processes > End Process button, whereupon I can continue with the Maxima session.

If anyone can provide information that could help fix this, I would be grateful.

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[Maxima] problems with proportional plots
David Billinghurst dbmaxima at gmail.com 
Sun Nov 14 18:16:04 CST 2010 

David Billinghurst wrote:
> Christian Stengg wrote:
>> Is it possible (with little effort) to make Maxima 5-22.1 use the new 
>> gnuplot version?
> ...
>
> You may also be able to redefine the maxima variable gnuplot_command - 
> default wgnuplot - to point to a different version.
Yes.  This works for me.

(%i1) gnuplot_command:"c:/programs/gnuplot/binary/wgnuplot"$
(%i2) plot2d (sin(x), [x, -5, 5])$

runs my installed gnuplot 4.4.2