Two bugs with Keyboard Shortcuts: confirmation and/or solutions requested

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http://askubuntu.com – I have 2 bugs in my Ubuntu 12.04 fresh installation using a Macbook Pro keyboard. Note: I swapped the Ctrl and Cmd keys (Ctrl and Super on regular keyboards), but that should not affect the shortcuts I program.) First I changed the Switch application shortcut from Alt-Tab to Ctrl-Tab. It saves this correctly but the change does not seem to take effect. I rebooted and it still doesn't. Alt-Tab stays working and Ctrl-Tab does nothing. I know Ctrl-Tab is used by the Chromium browser, but outside the browser the shortcut isn't working either. Can anyone confirm this? I changed another shortcut i (HowTos)