Has anyone seen this visual glitch? (running on Nexus 6)

[Awkwardsheep]

This particular screenshot is from Legend of Heroes: Trails in the Sky, but it occurs in every other game as well. Whenever I open a menu, the screen transitions or even when a text box comes up, the game fuzzes out like this.

The problem doesn't happen with Non-Buffered Rendering, but that comes with its own set of problems, like in-engine cutscenes just being completely black with the exception of text boxes, lots of graphical problems etc.

No one else has this problem with Legend of Heroes, so I assume it must be some kind of issue with my hardware, software or settings. I haven't played much with the settings though.

Anyone have a clue?