Windows 10: Strange blue rectangle at corner of desktop

Hi all,


Recently I've had this strange white rectangle appearing in the top left corner of both my PC and my computer's desktop. I have no idea what it is because I can't find it in task manager. It seems to disable Wallpaper Engine as well. It is also completely un-interactable.


Google searches about this seem to bring up a similar issue where there is a much smaller white square but the fixes for that don't work for me.


Anybody have any idea how to fix this?

:)

 

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