I too have been suffering with the exact same bug on Wheezy and it constantly freezes gnome-shell 3.4 and freezes various games that use OpenGL. I have, however, found a workaround by installing the 32-bit version libgl1-nvidia-glx:i386. I'm not sure why the 32-bit one is working and the 64 bit one isn't.
--Basic system info.-- * Linux 3.2.0-4-amd64 #1 SMP Debian Wheezy 3.2.39-2 x86_64 GNU/Linux -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org