I recently switched from the regular 3 way slide lock screen to a PIN unlock. I only intended to do this briefly, just to keep people from messing with my phone while it was charging. Anyway, when I tried to switch it back I found that the options Lock Screen, No Lock Screen, and Face Unlock were grayed out with the message "disabled by administrator, encryption policy, or credential storage". I didn't make any changes to any of those things (unless I did it unknowingly) so I'm not sure why this is happening. I'm running non-rooted stock Verizon Sense 6. Anyone else have this issue or know how to fix it? I like being able to have an easy lock screen most of the time.