Re: SDL Parachute error
If you are going to use "rpm -e ..." on the Mesa libGL, do it BEFORE installing the Nvidia driver. The instructions on that site are a recipe for failure, the readme file Nvidia provides covers everything you will need to do or watch for. Rerunning the Nvidia installer should solve the SDL issue for you.
As to the sound problem, is the module for your soundcard still being loaded?