I install ATI drivers using RPM from ATI as root. Follow all directions. It works. I restart the computer. I sign in a user name - not root. It works. I logout. When I log back in it doesn't have 3D capability. I am using kernel 2.6.25-40 (I think) and the latest ATI drivers available from ATI.
Any help is appreciated, if you need more info let me know. It is a default install, all files should be in standard places.
PS Standard install doesn't provide 3D capability and when I looked it up the source said to install ATI drivers from ATI to get it.