Looks like your GLX is up and running, but either SDL isn't able to initialize the GLX layer, or the driver is malfunctioning. Try the following, in this order to see if it fixes anything:

1) Reinstall all "SDL" packages you have installed
2) Reinstall all "glx" packages you have installed
3) Reinstall the ATI drivers

Try them one at a time, and hope that one of 'em fixes it.

~~ Andrew D.