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What is the keyboard shortcut to minimise a window to launcher in unity?

I upgraded from Ubuntu 11.10 (with Gnome 3.2 I think), to Ubuntu 12.04 with Gnome 3.4.1, and my custom shortcuts have stopped working.

Opening up the All Settings -> Keyboard -> Shortcuts, I can see that my shortcuts are still there.

All of the shortcuts that I didn't change are working, and my shortcuts in the custom section are working (eg Ctrl+Alt+G to open gedit), its just that the shortcuts I had customised before the upgrade no longer work.

Under Launchers, I had changed "Launch Terminal" to Ctrl+Alt+T, and under Navigation I had changed move to workspace above/below to Shift+Ctrl+Up/Down.

Investigating further, it looks like the default shortcuts for these actions work (Ctrl+Alt+Up/ Down moves me up and down workspaces), so I'm guessing that there is some discrepancy between what I am seeing on the Keyboard Settings and what my computer is reading from.

Any help would be appreciated.