deleting luaui/config made no difference
Fullscreen = 0
WindowBorderless = 1
WindowPosX = 0
WindowPosY = 0
was the default. deleting the lines setting the screen resolution didn't change anything.
fullscreen=1
WindowBorderless=0
and deleting screen resolution lines did make a diffrence; instead of only getting the top left 25%, I got the center 25%. :/
deleting configs and clicking "high" restored the original problem.
I also checked to see if my video card driver was up to date. It was not. I updated, but same problem. 460GTX btw.