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[Q] Mysterious Lock Screen

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Default [Q] Mysterious Lock Screen

2 days ago I started getting a strange lock screen on my S3. I noticed it when my alarm went off in the morning. There was a plain black and blue lock screen. When I swiped past it, my alarm showed up. When I dismissed my alarm, my normal lock screen showed up (complete with the normal unlock pattern dots.)

This new lock screen doesn't show up all the time. Maybe 2-3 times per day. I think, but I'm not sure, that it's being triggered by the phone going to sleep. Turning the screen off and on only triggers the normal lock screen. The new lock screen never overrides the default lock screen - it's just over top of it. Also, it looks like if I disable lock screens altogether in settings, the new lock screen goes away.

I've uninstalled all launchers except Lightning Launcher and TouchWiz. LL's lock screen is a separate app that I do not have. I've uninstalled all lock screen replacements that I know of (I only had Widget Locker). I checked the list of recently updated apps to try to figure out if it's a new "feature", but nothing. I've checked the list of running apps, along with apps that automatically start up on load and I don't see anything strange.

Does anyone know of a way I can determine how to figure out what this is? I'd like to get rid of it.

I'm running StockMod ROM 4.3 (rooted). A screenshot is attached.

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Does StockMod ROM come with the Active Display feature? Because what you are seeing might some kind of Active Display...
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I didn't see Active Display, but I did notice that Dynamic Notifications was enabled. Not sure when or why. I turned it off and I haven't seen anything pop up since. Hopefully that was it.

Thanks for your help!
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