I'm getting a black rectangle with a 1 in a square and the words Lock and Unlock on it

[Christopher Kinsella1]

I'm getting a black rectangle with a 1 in a Square and the words Lock and Unlock that just keeps popping up in the upper left corner of my screen. Pressing 1 doesn't do anything and my lock screen doesn't engage but it's annoying. I've rebooted my computer twice but it still happens.

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