Comment 62 for bug 197163

Hi everybody,
someone can help me about the windows pop up in mathematica.
I just tried the solution given in :
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/197163/comments/40
it doesen't work for me..
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how can i change the font size. in the ppreferences menu, the font size is 12, and I can't change it;
thanxxx.
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have a look to this :http://linuxexpert.wordpress.com/2007/08/25/how-to-install-mathematica-6linuxubuntu/#comment-161