I can confirm this bug. Though, I have not found a concrete way to reproduce the freeze. However, it happens just as most of the people have reported, it's seemingly random, and I can still move the mouse but everything else doesn't visually respond. "Ctrl+Alt+F1 -> killall gnome-shell" works to restart gnome-shell, and all is well until it freezes again.
The only bit of information I can give is that my current system was setup by installing Debian Squeeze then upgrading to Wheezy. And that I have my keyboard set to nearly no delay and very fast speed. Is it possibly just faulty hardware? Can a video card break in such a way that only a specific graphic function can make a program unresponsive? -- System Information: Release 7.0 (wheezy) 64-bit Kernel Linux 3.2.0-4-amd64 GNOME 3.4.2 Memory: 3.9 GiB Processor: AMD Phenom(tm) II X6 1045T Processor × 6 Available disk space: 60.2 GiB Foreign Architectures: i386 Shell: /bin/sh linked to /bin/dash -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org