I updated xcb-util and stupidly obsoleted the old libs (which have been merged in the one lib), this broke the BS.
First thing to do is rebuild startup-notification, but it fails, and I don't see why http://pkgsubmit.mageia.org/uploads/failure/cauldron/core/release/20110706093849.ahmad.valstar.8189/log/startup-notification-0.12-2.mga2/install_deps-1.0.20110706093902.log lib64xcb-util0[== 0.3.8-1.mga2] should be available already from xcb-utils-0.3.8... so help! -- Ahmad Samir
