The GTK applications on the Knoppix CD, like Firefox and Gimp, do not display the correct menu, toolbar, and dialog box font size on newer terminals. There is an easy fix that takes only 308 kB total, including config files. There is practically no documentation on this and the fix is not obvious.

First install the package gtk2_engines_gtk_qt. This adds an option to the KDE Control Center. The option "GTK Styles and Fonts" will be in the "Appearance & Themes" section. The styles MUST BE ACTIVATED to change the menu and dialog font size. Click on "Use another font" to enable the apply button. Click back to "Use my KDE fonts in GTK applications". Then click the Apply button. This will create the files .gtk_qt_engine_rc and .gtkrc-2.0 in the $HOME directory.

Firefox and Gimp will now display the same menu and dialog font size as the KDE programs.

I assume that the display is okay on the dvd version since it contains both KDE and Gnome.