Seems that the main problem is the x configuration file.
I replaced it with a 5 line config file and the gl problems and kde " display " segfault problems have gone.
the reminding problem is a bad exit from gl where the parameters for the screens come back wrong
and the fact that the same " display " settings dialog does not see that it's a dual head , though it shows both
monitors , but id's them wrong ( both id's show on both screns )
xrandr does place the monitors in the right sequence and xinerama is working.
Tell you . if there's a bug somewhere .. ill find it , i get them all