i had this same problem and someone on this board helped me. I did have to recompile the driver or install the rpms and install. I had to do this only for the drivers that i downloaded and compiled myself to fix it. I chose to install from the rpms
i installed the rpm's then ran the yum -y install "driver" in my case kmod-nvidia
im new to linux, and dont know much just passing info, my post was yesterday if you want to read it.
the sticky post A must read,before installing Nvidia & Ati has the rpms for video cards
The below link has a good article in section 5 on making the xconfig file