Problems with updated XFree86-4.1.0-50.EL and nVIDIA drivers

Hi,

Since I've updated my RH 2.1AW system to XFree86 4.1.0-50.EL, I now get
a lot of unresolved symbols with nVIDIA drivers 4050 and 4431 (provided
by hp). I hadn't these problems with the XFree86 version shipped
standard with vanilla RH 2.1AW (except for GDM needing VT-switching to
display the login dialog and garbaged KDE desktop, although GNOME and
WindowMaker run fine).

Any hints to solve the unresolved symbols with the updated XFree86?

Thanks.