unity-control-center keyboard shortcuts broken

[Echo Nolan]

The keyboard shortcuts configured in System Settings -> Keyboard -> Shortcuts appeared to be ignored. This is a regression from 14.10. Specifically:
- Launch terminal is set to Ctrl+Alt+T. Nothing happens.
- Move window to workspace 1 is set to Shift+Super+Home. Nothing happens
- Move window one workspace to the left/right/etc is set to Shift+Ctrl+Alt+arrow keys. These work.
- Similarly, switch to workspace left/right/etc is set to Ctrl+Alt+arrow keys. Those also work.
- Print screen, plus various modifiers is set to take screenshots in various ways. These don't work.
- Log out is set to Ctrl-Alt-Delete. Nothing.
- Lock screen is set to Ctrl-Alt-L. Nothing. However, Windows+L does lock the screen.

There's more, but you get the idea I think.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: unity-control-center 15.04.0+15.04.20150410-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sat May 2 12:49:10 2015
ExecutablePath: /usr/bin/unity-control-center
InstallationDate: Installed on 2013-11-03 (545 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: unity-control-center
UpgradeStatus: Upgraded to vivid on 2015-05-02 (0 days ago)
usr_lib_unity-control-center: deja-dup 32.0-0ubuntu5

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.