Third party lockers not working?

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http://forum.xda-developers.com – I've been having some problems with third-party lock screens, for some reason they'll work for a while. But then randomly they will just not lock the screen. Also, no matter what I do the stock lock screen will not go away. I've tried Go Locker, wp7 locker, and magic locker, and none have worked for me. Is there any solution for this? I like having custom lockers so this is extremely irritating. Sent from my SPH-L710 using xda app-developers app (HowTos)