How do I re-enable swipe to unlock? I recently encrypted my Android 4.4.2 device (S4 Active) and have now unencrypted it. However the only options I still have to unlock my phone are PIN and Password. When I attempt to change it it now states that swipe is turned off by; Administrator Policy, Encryption Policy, or Credential Storage. 

How do I go about setting this back to how it was? Is it even possible or am I stuck using PIN or password?
I wonder if you say you have decrypted your phone because my phone (CyanogenMod 11) says explicitly that the only way to decrypt is a factory reset. http://imgur.com/iFXxsbC.png

So in your case I would look if your phone is really decrypted.