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I haven't heard of this issue before. You might try redownloading it. If you have anti-virus, that might be affecting it as well. AVG dislikes Unity games quite a bit.

This may be a solution, I do use AVG. I also tried reinstalling it, but the issue kept happening. 

By the way, I sent an email to the support in case you don't see my comment here, but since I saw your reply you can ignore the mail.