The issue that we are discussing here is not connected to patch 1.2.0 I believe. It was happening before the update and remains the same after it. I know that many guys are facing problems after the update to 1.2.0, but it is probably something different.
I have found out a solution for the problem. I exited all software that is monitoring the desktop (TeamViewer in my case) and than the game is starting without any problem. I hope that it helps you too, iTzPhil.