Same thing here, however I had only one program that crash : xsane
xsane hpaio:/net/Officejet_J6400_series?ip=192.168.0.12
Xlib: extension RANDR missing on display :0.
The program 'xsane' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch
I can confirm what has been said :
-without xinerama : works perfectly
-with Disable glx : works, but no 3D of course
here is my error message :
Jun 9 12:26:22 france kernel: agpgart-amd64 :00:00.0: AGP 3.0 bridge
Jun 9 12:26:22 france kernel: agpgart-amd64 :00:00.0: putting AGP V3