I added a 2nd user on my galaxy tab, just experimenting. Months later, I switched user to it, just playing around. And discovered I don't know it's login pattern. Can't login, cant switch user back, and can't reboot (requires pattern to reboot) - all of them want the 2nd user pattern, which I don't know. And it's up to 10 minutes between login attempts, as I keep trying. I'm stuck! Suggestions?