fonts in kde 3.1.1

hi,
I've a slackware 9.0 installed (with a 2gb full install) that comes with kde 
3.1-4, recently I upgraded to kde 3.1.1 but there are problems with fonts.
They do not like very well, with helvetica size 10 for example some characters 
seems like bolded, even with AA disabled or enabled. Here's a list of the 
.tgz that I've installed:

arts-1.1.1-i386-1.tgz
kdeedu-3.1.1-i386-1.tgz
kdepim-3.1.1-i386-1.tgz
kdeaddons-3.1.1-i386-1.tgz
kdegames-3.1.1-i386-1.tgz
kdesdk-3.1.1-i386-1.tgz
kdeadmin-3.1.1-i386-1.tgz
kdegraphics-3.1.1-i386-1.tgz
kdetoys-3.1.1-i386-1.tgz
kdeartwork-3.1.1-i386-1.tgz
kdelibs-3.1.1-i386-2.tgz
kdeutils-3.1.1-i386-1.tgz
kdebase-3.1.1-i386-1.tgz
kdemultimedia-3.1.1-i386-1.tgz
qt-3.1.2-i386-1.tgz
kdebindings-3.1.1-i386-1.tgz
kdenetwork-3.1.1-i386-1.tgz
quanta-3.1.1-i386-1.tgz

I'm missing something? before the upgrade all fonts were well.. thanks for 
your support.

kain