Debian Unstable, a k a Sid, has been, well, a little unstable lately. First, grep broke during one of my wildly optimistic dist-upgrades and I had some trouble booting and starting X, then xscreensaver and nvidia couldn’t agree so X crashed. Cost me half a day, all in all.

Lesson: When working anywhere near a deadline, do not dist-upgrade. And above all, do not reboot.