Invisible Skill Shots

I have encountered this visual bug many times as have my friends. While I may not have as great of a computer or graphics card as them, they have high-end computers who have these graphical glitches. Invisible Mundo Cleavers are not fun to dodge, and recently I've had trouble with Ahri's Orb of Deception in a couple games. Oh, and Nidalee Spears. That's just unfair. Could you look into this? I'm sure I am not the only one.