CLIENT BUG

So, as of yesterday my client has officially stopped working properly. It works fine logging on and everything, but when i try to get into a game, the loading screen just goes black, and I can never join in (Even on custom games). It happened mid-way through a game I was in yesterday, and when I used COMMAND + ALT + ESC ( I use a Macbook Pro 2015 model) and tried to rejoin the game, I first discovered this issue. I need help fixing this so i can get back out on the rift! Another thing, when i logged onto my account on my friend's computer I was able to join in fine, so I'm assuming that it has something to do with the fact that I'm on a Mac. ANY HELP/TIPS ARE APPRECIATED.