Weird bug - Window flashes on screen

Hoping someone can help, can’t find anything online.

The problem is that while I’m playing a blank window will flash on the screen for about half a second (if that) constantly at random intervals. The window has the Halo UI, and an x in the top-right to close it, but it flashes on and off so quickly I can’t click it during gameplay.

It appears in menus, during cutscenes, and during gameplay, with seemingly no rhyme or reason. I’ve deactivated everything I can behind the scenes and it still happens (alt-tabbing doesn’t show any other windows).

Does anyone else get this?

System:
Core i5 4690K
8GB RAM
Windows 10 x64
GeForce GTX 1050Ti

Yes. Just installed the game and started it up and this exact thing is happening to me. Did you find any solution?

dsplzion

https://youtu.be/9PG95T9JfQY