I then tried to start them from terminal and got this error:
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X Error of failed request: BadRequest (invalid request code or no such operation)
Major opcode of failed request: 158 (GLX)
Minor opcode of failed request: 19 (X_GLXQueryServerString)
Serial number of failed request: 10
Current serial number in output stream: 10
Google gave me this:
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/293012
chobthum wrote on 2009-03-03: (permalink)
I have got the same problem
and now it was solved by just remove xorg-driver-fglrx
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sudo apt-get remove xorg-driver-fglrx
sudo reboot
Then all my OpenGL and blank screen bug disappear.
and that fixed it for me too