I am running 5.0.0.0.411 and pressing the top lock button simply locks the keyboard if you don't have a security password enabled. If you do have a password enabled then the lock button will lock the device and a password will need to be input to unlock.
Obviously this may have changed with .509 and that is why I downgraded back to .411.
Cameron
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2 9650s on T-Mo 6.0.0.3049 BIS
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