Don't update to OS X Yosemite on a Mac!
So earlier today I was playing League on my Macbook Pro with Retina Display and I was running OS X Mavericks (Have been doing this since August of 2013) and haven't had any problems. But today after seeing that Apple had released OS X Yosemite I was excited so I obviously downloaded it, took about an hour for everything to be running properly until I played a game of League and my mouse wouldn't move anywhere except for along the top of the screens edge (Only in-game) I not only lost that ranked game but now I won't be playing League until this is either fixed or I am able to downgrade the OS of my Mac. I beg of you Riot look into this A.S.A.P.
Edit: Also using a 2014 Razer Naga with Razer Synapse 2.0