Yep - that happened to me. I had another Gallery app (quic pic) as well as a wallpaper app I was using. The way I fixed it was to go to the particular app in application manager and clear out the "defaults" as well as the cache. The Lock screen uses a specific size/resolution. You have to use the stock Gallery app for it. My problem was that I used another app to edit the wallpaper and set it to use as default. Once I cleared the default and used the Gallery app to crop, I could apply any lock screen wallpaper.
tried everything posted here, nothing works :/ unable to change the lock screen wallpaper
I have the similar problem which annoyed me for over a week but the fix as follow:
Goto Setting > Application Manager > call up the sub menu then "Reset App Preference"
After doing the above, when you go to change "lock screen wall paper", please select the "gallery" instead of any other 3rd party "Quick Pic" open the file. Then it's done. If you need to "edit" the photo for the Lock Screen wallpaper, I use the "Photo Editor" which works perfect too. Good luck
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I have the same problem of not being able to use the wallpapers that came with the phone on the lock screen. I am very frustrated not being able to do so on my $600 SIII i9305.
I had changed the lock screen options to use a password to unlock the phone. This seems to prevent changing the lock screen wallpaper to one of the stock wallpapers. You can use any picture from the gallery or any of the Live wallpapers though.
After I removed the password option and used the swipe unlock option, I was able to use the stock Wallpapers, the Live Wallpapers, or the gallery pictures as background for the lock screen.
If I go back to any Screen Lock options that require a pin, password or pattern, the screen will go back to the last gallery image or stock wallpaper that had been set before.
This is really frustrating.