Black Screen of doom.

IT's FIXED! I don't know how, but I tried another custom game and EVERYTHING WENT FINE! -w-

So erm, for the past three days or so, I've been receiving a black screen on my league client. It happens in between the Champion Select screen, and the loading screen (into the game) as it opens. I've had no issues when I login, open the client, and such too.I use a MacBookPro, and its on OSX ver. 10.8.5 I don't know if this has anything to do with it, but because of this issue I was placed into low priority queue just now. It could just be my new wi-fi box, considering it's quite unreliable, or potentially the recent intense weather. I don't know what's the problem, but I was wondering if anyone has any advice/help to this issue. Thanks~ EDIT: I just tried a custom game, Me (Leblanc) vs a Beginner Tristana bot. Same thing happened, Champ select's over, IMMEDIATELY turns into a black screen (also the cursor can move, but it doesn't change into the glove looking one) then I force quit. This time however, the champ select is still going. The problem still isn't fixed and I don't know the cause of it. -First, Everything from the launch client and the store etc. is perfectly normal. -Immediately after, once I join into a game I get into champ select, nothing wrong there. -Once champ select is over, the loading screen is black, and the cursor doesn't change. If I click anything or try to type while in this screen, it makes that annoying "DING" sound you hear from apple computers. -I force quit, and as usual it says "Reconnect" in the client. -I reconnect, and then the black screen reappears. -The second or third time this happened, I waited 20 minutes or so, and soon the game was (most likely) over. But the screen didn't change -Force quit, and I got the priority queue thing for not participating/afk