Mac client won't open. At All. [Client]

Since patch 6.6, every time I open the client, absolutely nothing pops up. When I click on the League application icon, it brings up a white rectangle where the League logo would usually be. That rectangle then disappears and sometimes a tiny white box takes its place. I'm playing on a Macbook Pro running OSX 10.11.2, and I'm certain that this isn't a hardware issue. I've gone through all of the troubleshooting steps I could to try and get this to work, including reinstalling (numerous times) but at this point I'm starting to think it's not my computer that's having problems. I'd also like to note that the PBE Launcher didn't work for me in this last cycle, or this cycle (the exact same issue occurred as the one I'm having on Live), so I believe it has something to do with the content released in 6.6.

I'd appreciate a response, considering I haven't been able to play on my Mac for about a week or two now.