Whenever I start up DD2 I get an "Authentication Failed" message. It says, "Could not successfully authenticate with Steam. Please try restarting the application. Contact support if the problem persists." I've already tried restarting steam, restarting my computer, and yet I still get the same error message every time. I am on the same account that I purchased the game, I did not purchase the game on a mac and am not family sharing, nothing has changed from when I played yesterday, other than the fact that I can't play. Thanks in advance, Zach