Resolution issues on Mac.

I've been reading that for some people, when they're loading into their game, their client takes a quarter top right of their screen. For my I've been having a different issue. Usually when I load into game I have my resolution set to windowed 1366 x 768. This setting is enough for the game to be full screen, without me actually having to pick the actual "full screen option". Ever since the new patch this doesn't work anymore and I'm forced to keep it on full screen. I can't alt tab anymore to change a song or do whatever I do while walking to lane.

Is this because of the new patch or is it just me?

Please help.