Well, the message i get doesn't really give me an idea of what could be the problem, last time i login (yesterday) i could play with no problems
Mac user btw
Screen: http://imageshack.us/photo/my-images/140/errorzy.png/
Specs:
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Processor 2 GHz Intel Core i7
Memory 4 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6490M 256 MB
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The first thing to do is always reinstall the game