nivlac:
I get that when I play on 16-bit color depth instead of 32-bit. Installing the new monitor might have dumbed down your color quality. Check that out.
yeah the color quality setting was at 16bit. Fixes it when changing to 32. Tried changing it while window was open and even if you put it to 32, the highlited squares are still there. Have to close window and when you resume game it looks normal. Same thing if it's 32 and you want to test to see squares by putting it to 16, doesnt show up till closing the window and restarting a new one. Didnt have to close all browser windows, just the game window... That was tricky when testing what was causing it because didnt look like changing the setting did anything.
So thats what it is, betcha there's some players with those squares all over and dont know anything about how to fix it. Do they have anything about that in the help section?