I have always preferred the pattern screen lock. While on a road trip, I turned it off so it could be easier for using the map, nav, etc. So when I got home, I wanted to turn it on again, but now all my choices (None, Slide, Face, Pattern) are all dimmed and say "Disabled by administrator, encryption policy, or credential storage". Only my PIN and Password are available to me now. How do I get my pattern unlock back?