I deleted the bulk of my profile (.gconf, much of .config, etc) and the problem has gone away. Something was probably broken during the upgrade with keyboard shortcuts, possibly in Unity itself. Regardless, I'll probably never be able to reproduce this so I'm closing the bug.
** Changed in: xorg (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1303271 Title: Spacebar and top-row 4 not working since upgrade to trusty To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1303271/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp