I have a RH 7.0 system fully update + kde2.0.1. I installed XFree86-4.0.2 and qt-2.2.3 in order to get Keith's render extension and antialiased fonts. Now I have 2 problems: 1) konqueror when loaded from inside gnome instantly kills the X server. 2) all the fonts in kde2.0.1 are anti-aliased but have the same typeface, not mather what font I choose. Downgrading to qt-2.2.2 previously released in rawhide avoid the two problems above.
I can't reproduce 1). 2) is an INTENDED effect of the Anti-Aliasing feature (it uses only fonts that support AA), if you don't like it, turn off Anti-Aliasing (export QT_XFT=0). Qt 2.2.2 fixes this for you because it doesn't do AA.