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What drivers do you use? I've got similar problem and combination of removing nvidia drivers and changing mode did the trick for me. I'm also not 100% sure, but last time I've installed and tested ogre before I installed ROS. I've got this idea after I noticed that different png-libraries are used and I've decided to give it a try.

You can also take a look into /var/log/Xorg.0.log file to see what modules have been loaded and whether or not you have any problems. It could be that your xorg conf is pointing to the wrong location. This is from my log:

(II) Loading extension DOUBLE-BUFFER
(II) LoadModule: "glx"
(II) Loading /usr/lib/xorg/modules/extensions/libglx.so
(II) Module glx: vendor="X.Org Foundation"
        compiled for 1.7.6, module version = 1.0.0
        ABI class: X.Org Server Extension, version 2.0
(==) AIGLX enabled
(II) Loading extension GLX