I recently installed latest nvidia drivers build [5336],X started without any problems,nvidia splash screen appeared etc. I`ve done all necessary conf i my XFree86-4.conf [uncomented GlCore and dri, replaced nv with nvidia etc. etc. but when i try to use ANY GL application [like screensaver,xmms vis. plugins] X server crashes with following error Caught Signal 11, X server aborting .This happened after (II) [GLX]: Initializing GLX extension.
The strangest thing is that when i run X as root all GL apps works just fine - no problems at all, but when i run it as ordinary user, GL applications crash X server. This made me think that the problem is somehow connected with nvidia driver files and their permissions but i don`t know which ones.
In the other hand sometimes and somehow GLX GOT INITIALIZED an i succeed running GL app but just for a few seconds before X crash again, which makes me think that is not permission related problem after all.
I`ve read a lot of things in this forum and i`ve tried almost all posted here but i still can`t find a solution or exponation of this issue, so i`ll appreciate any help given.

i`m running:

mdk 9.2
2.4.22-10mdk
XFree 4.3.0
nvidia 5336 driver
GF MX440 AGP 8X

well i am thinking this is a misprint on your behalf but if it isn't then this is wrong ...
you have to comment out these lines ... by putting a # in front of it ...
or just simply remove these lines ...
and then make sure you do have Load "glx"
and your correct with the changes with nv to nvidia ...

so since your information might be misguided, go and check these above things mentioned, or simply state otherwise that you made some typ0s in your post

I commented out
Load "dri"
Load "GLcore"

I have Load "glx" in my config.

And one more thing.I found this in man 7 signal

SIGSEGV 11 Core Invalid memory reference
Core Default action is to terminate the process and dump core.
Like SIGILL, portable programs should not intentionally generate invalid memory references.

Invalid memory reference only when i`m with user account?!!?!?

Please, forgive my ignorance but i really can`t understand this different memory references depending on the user account?!?!

I also found sam problem reported with Caught Signal 4.

SIGILL 4 Core Illegal Instruction
Illegal instruction indicating a program error. Applications may wish to catch this signal and attempt to recover from bugs. A portable program should not intentionally generate illegal instructions.

Any ideas what to do?

thanks in advance

read what i said
here about signal 11

maybe it'll turn out to be more of a deeper issue rather than simply your config file ..