I have tried all the steps listed above and when I try to launch RimWorld Beta 18 from steam the icon for RimWorld shows on my task bar but the game does not appear. If I hover over the icon, the thumbnail shows is a black thin line. It was working yesterday. I had been putting off the most recent Windows 10 update and finally decided to install it this morning. I have attached the output log, if that will help anyone try to figure out why I am not able to load the game. Any help will be greatly appreciated.
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