Using the weather lock screen. Today I got the bug where the bottom half of the screen was black and the whole lock screen was shifted up. I think someone else posted about this in another thread, but after trying to switch between lock screens it looks like it's specific to the weather lock screen.
If it helps, it seemed to happen after I disconnected the phone from my car charger. When unplugging it, the screen was all screwed up. I just hit the power button and got out. Later when unlocking the phone it looked like the phone was trying to put the lock screen in landscape, but just freaked out and it never lined up again.
Reboot fixed the issue.