Disabling Secure Lockscreen (Lollipop)

I was recently messing with the different lock screen security options possible however I noticed that I can no longer go back to "Swipe" to unlock. Does anyone know why this is? That and "none" are grayed out in the settings (see screen shot). Anyone know how to get myself back to swipe to unlock?

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I had the same issue, I had recently installed some apps (VPN clients etc) which did something to the security I think. If you revoke their administrator access then you get the lock options back.
 
Did a complete reset last night due to memory issues.

I cannot clear credentials, it is greyed out
No pattern or swipe options. I can only enter a pin.
There is not "guest" under my accounts

Ive setup smart lock so I dont have to enter a pin at home and at work (not my recommendation at work) but entering a pin in the car is a pain.

Any other options?
 
On my Nexus 6, I went into settings, then security, then i touched screen lock, entered my pin and pushed the green arrow in lower right corner. After I did this sequence, I came to the screen where all my choices were visible to chose from for unlocking my phone.
 
I agree with Nonymous666's concern about not wanting to allow guests, it allows anyone to bypass my lock screen on my tablet by simply choosing guest, and they have access to all my files, photos, videos, and music. The only thing they don't have access to are what apps i have installed, and who cares those are all public apps. Before if someone stole my tablet it would be a paperweight for them now they can log in as a guest and they have a new tablet. This should really be something easier to turn off. The right way to do multiple users should be allowing me to create a guest account if i want one. not letting someone without the passcode create a new account with access to all my files.