My lock screen just shows a black background and a User Name/Password dialog after opening the screen from sleep. How do I get it back to where it blurs my desktop image with the dialog and my account image displayed?

I'm not sure when it began, but now my Macbook Air only shows a black background and a User Name and Password dialog box when I wake it from sleep. It used to show my desktop background blurred with my user name and icon displayed with only a text field for entering my password. I'm currently using Yosemite (OS X 10.10.1) and all updates have been done. Any help or suggestions would be greatly appreciated as I know this isn't a real problem, just an annoyance since I couldn't find how to change it back in the System Preferences.

I just have to point out that after looking at a related post (https://discussions.apple.com/message/22661092#22661092), it brought to memory that my issue most certainly began happening after I added some DoD certificates to the keychain. This obviously has something to do with it, but it still leaves me wondering what actually causes this to happen. :/

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