I'm not sure if it's your solution, but did you read MESA 3D library notes in LV distribution? NI slightly modified this libraries and included in distribution.
Sometimes there were troubles with shared graphics libraries. Hopefully you need to examine lib versions being called.
I was tried to install KDE2, but having troubles moves me back to KDE1 and to my lovely FVWM. KDE2 is too differ inside, so I'm waiting NI approval of this desktop manager before using it.
I'm using Slackware 7.1 from scratch.
Best Regards to Linux user,
Sergey.
Sergey