Colored box highlights [GAMEPLAY]

Any time I am in game and click on anything, such as a minion to ascertain it's health in order to last hit it, as long as that creature is selected any other clickable creature/item will have a large square box covering it. So if I click on a champion to see if I can towerdive for a kill then my cursor happens to hit the tower hitbox, my screen is flooded by a giant square that completely obscures what is near it.

1: Enter any game 2: Wait for minions to spawn 3: Left click any minion or tower 4: Hover mouse cursor over any other clickable object = Giant colored box :(

This has been happening for weeks now and I can't figure out the problem. Have completely uninstalled LoL, and my graphics drivers, and even switched back to my motherboard's GPU to remove the card. I unfortunately do not remember what patch it started during :( but it was around the time the new summoner's rift went live beta.