MAJOR GRAPHIC BUG WITH PATCH 4.20

Found fix:

http://www.reddit.com/r/leagueoflegends/comments/2mz0n8/solution_to_420_patch_rectangle_bug_over_champs/

Ok what i found that causes this bug is one of the common fps fixes. If you changed colors=32 to colors=16 in the game.cfg file. Then change it back to 32. The bug will go away.

well i have the same issue. And here is some truly bad situation from game ...

omg this same i have..

http://forums.euw.leagueoflegends.com/board/showthread.php?t=1998485

http://boards.na.leagueoflegends.com/en/c/bug-report/bxoJqEg1-random-in-game-message-and-bluered-box-squares

Thats happening to me too, there's mine. It occurs on minions and sometimes champions but mostly turrets and minions and causes FPS drop making playing difficult.

It seems to be effecting us with low end computers

ive got the same thing on a AMD processor and Nvidia card hope this gets fixed soon