No the problem isn't solved! But...
First TQ 4 your interest 4 my trouble.
I've installed the custom driver with --add-this-kernel (but it isn't necessary the wonderfull installer make it 4 U).
Then I've configured my XF86config and then I've deleted the MESA GL library rpm.
As before happened (before the removing of MESA lib) the first time I run x-server with the accelerated driver I'm able to see the nVIDIA logo and than x-server crash. The other times I tried to start X-server it crashed before the nVIDIA logo. I've saved the first log, give it a look and tell me if U have some ideas (I hope so).
Could U send me the log file of your uncrashable x-server?