Which means...
I've got 192 uploads to unstable since Sunday when the freeze was lifted. This machine being my lapper. On my desktop ... 338 updates... which means many thing will be broken on it.
You shouldna updated today... or even for the next week unless you are willing to use other desktops in the time being. Every release since Sarge have broken GNOME hugely in Sid for at least a week typically more.
Unstable always breaks under the gush of uploads after a release, its not just GNOME being broken today, looks like XFCE has a partial update to 4.6 going, LXER has some updates to the newer implementation and parts of KDE are borked as well.