Problems with smoothing.

[Paonsol]

Hey folks

So I'm wondering what's causing this (picture 1 down there):

To change into this (picture 2 down there):

If I change the texture settings or post-processing, it smooths everything out like that, but if I move on the menus, it all becomes jagged like in the second picture.

It's going jagged and immediately *trying* to smooth it out sometimes when I navigate the menu, but only for a little while until it just gives up and stays stuck looking pixelated.

Any ideas how to fix this so it stays smooth?