I dug a little deeper into this. Upgrading to dri2proto-2.6, xorg-server-1.10.4, and xf86-video-intel-2.16.0 cause no harm, but upgrading mesa to 7.11 is what breaks sviewgl. (I didn't know it used mesa, but maybe there's a conflict with freeglut).
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error log (part of .xsession-errors)
I dug a little deeper into this. Upgrading to dri2proto-2.6, xorg-server-1.10.4, and xf86-video-intel-2.16.0 cause no harm, but upgrading mesa to 7.11 is what breaks sviewgl. (I didn't know it used mesa, but maybe there's a conflict with freeglut).