Odd bug lock screen loses ability to unlock

[trekgraham]

http://1drv.ms/1ul2vyJ
In the above image, I'm trying to unlock my phone but the keypad to unlock my phone go missing. Reboot fixes the problem but it has returned a couple times

 

[cbreze]

I'd maybe try a different lock screen. Could maybe be the issue, just a shot in the dark. Lockmix is very nice.