For some reason I always seem to have a problem with getting Lock Screens working.

At the moment I want to use this lock screen:

Name: OS7 Lockscreen v4.
Author/s: rpgpromaster, edited by GaN-MaN.

But it isn't working correctly.

My lock screen still has the default clock and space for slide to unlock (but the text is missing) and the wallpaper is black with a small ? in the middle.

Any ideas?