Okay, I ran Synaptic, completely removed the package deskbar-applet (this also removed ubuntu-desktop). Then I logged out, reinstalled both packages from a text console, logged back in to Gnome, added Deskbar to the panel, and everything works fine now. I've logged out/in/restarted a few times to confirm that it no longer hangs. It is good to have it working, but now I will never be able to find out what caused the app to hang in the first place. :(
-- Panel hangs on login https://launchpad.net/bugs/46150 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs