I've just enabled FileVault 2 on my mid-2012 MacBook Air and am worried it has crashed.
I've entered all the details and clicked "Restart" and now have a greyed out System Preference pane with a spinner.
If I try and manually restart from the Apple menu I'm told that System Preferences are stopping a restart.
How long should this stage take? Is it safe to hit the power button? I know the encryption occurs after a restart.