I have been using KDE 3.2 with QT3.3.0 and QT3.3.1 for a while and I realised that after running the Font Installer from the Control Centre, I can no longer print from non-KDE applications like Mozilla 1.6. Upon investigation, I realised that running the Font Installer in administrator mode wipe out the contents of the ghostscript Fontmap file (effectively making it a zero byte file), in my case it was "/usr/share/ghostscript/7.07/lib/Fontmap" on Gentoo Linux. Restoring the Fontmap file, restores printing from Mozilla. cat "(Fontmap.GS) .runlibfile" >> Fontmap KDE application may not rely on gs fonts for printing as QT can generate the needed fonts on the fly from the system fonts. That is the reason why Font Installer creates Fontmap in each font directory, right? However, it should take into considerations of ths non-KDE application which rely on the ghostscript fonts for printing.
This was http://bugs.kde.org/show_bug.cgi?id=75820, it should be fixed now.