Specifically I am trying to use the workspace switching shortcut Ctrl+Alt+←↑→↓. They work fine when I press Alt then Ctrl then an Arrow key, but not when I do Ctrl then Alt. This behavior even carries over for the Ctrl+Alt+Shift+Arrow commands for moving windows between workspaces. I am certain this behavior was not always so. How can I get back to the usual Ctrl/Alt order invariance?
Ubuntu 12.10 64-bit.
EDIT: Turns out this only happens when the Num Lock key is on. I have no reason to ever have Num Lock off, so I would really like to understand why Num Lock is somehow changing my Ctrl+Alt behavior.
EDIT 2: This only happens with the left alt key.