So I had my Line 6 POD X3 connected to my MBP via USB. My MBP was outputting audio (ie, iTunes) through USB to my POD, where I had my guitar and headphones plugged in. Everything was going just fine. I paused iTunes for a sec to adjust something, then hit play. Suddenly, I was getting no sound. So I quit iTunes and restarted it. Same thing, no sound. So I unplugged my USB cable. Immediately, my screen went grayscale from top to bottom, like a scanner or something. Then a message popped up that said "You need to restart your computer" or something to that effect in a bunch of different languages. What just happened? Was that a kernel panic or something?