Obtuse Triangle Upper Left Corner of Screen

[AwesomeHairo]

Hi. When I play any games, and some kind of effect happens with flashing, I see some kind of triangle in the upper left corner of the screen. Things that make it show up are things like going from the title screen to the select file screen in Final Fantasy and using magic that makes the screen flash.

I'm using a Intel Core i7 5700 HQ 2.70 GHz (Four cores)
8 GB RAM
Nvidia GTX750M

The settings I can screenshot, when I am asked to. It's using OpenGL.

[[Unknown]]

Have you made sure you're using updated drivers?

Does it happen in all games, or just that game? Is it the same shape in all of them?

Are you using any kind of post-shader? Does it help to reset to default settings?

-[Unknown]

[AwesomeHairo]

I'm using 1.2.2. Yes, all updated drivers (I play some PC games that recently came out). Happens with other games. I use the FXAA shader, but I've also played without any post-shader and it still appears. Yes, I reseted to default settings.

[[Unknown]]

Well, that's very strange. OpenGL is generally better, but can you try switching to the Direct3D backend? Does it still happen there?

-[Unknown]

[AwesomeHairo]

Yes, I tried. It happens less often, but unfortunately it's still there

[Henrik]

Hm. Are you using some kind of screen capture / frame counter application like Fraps in the background?