Blue square in upper-left corner of every game

In every game, there's a blue square in the upper-left hand corner of the game, in every game, whether it's during the intro, menu, or gameplay. This isn't an especially recent issue, some builds would cause it to appear and others wouldn't, however the last time I tried a build that didn't have it was a specific June build that I can't recall and I'm hoping to not have to regress back that far. Has anyone seen this before and know what might be causing this?

Examples:
Demon's Souls
God of War HD
ICO

I've tried changing interpreters, renderers, reverting to default settings, deleting and reinstalling RPCS3 from scratch, and all drivers up to date. I wouldn't be concerned if I could find any one other person on the entire internet who seemed to have this same issue, but I can't, so here I am.

OS: Windows 10 Home 64-bit
CPU: Intel Core i7 6700K
RAM: 16.0GB
Graphics: NVIDIA GeForce GTX 1080

Already explained but the solution here is disabling the performance overlay, which you have enabled with a very small font