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I noticed today that while Ctrl+Shift+Tab behaves as expected on my MacBook Air, it does nothing across apps (I tried Google Chrome and iTerm) when I'm using my USB-connected full-size Apple keyboard. I've recently remapped Caps Lock to Ctrl through the OSX Keyboard System Preferences. I've confirmed that the modifier key mappings are identical for both keyboards.
What should I try to diagnose/solve this problem?