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I've just updated to the most recent client, and since then it keeps popping up with Unknown Error (and next time I should probably take note of what else it said). The first time it wouldn't let me accept an invite, then it wouldn't let me invite and after about 7 error messages it quit. Then I joined the ranked queue, in champion select and it doesn't let me choose a champion, then eventually the error message appears again and I had to quit as it crashed (obviously this looks like I'm dodging). Any thoughts?
Im using a brand new iMac 21.5inch 2.7 GHz Intel Core i5, 8 GB 1600 MHz DDR3, Intel Iris Pro 1024 MB, OS X 10.9.1 and was all working fine until I updated this morning!