As reported earlier, some users find that when Solitaire Till Dawn launches, no game window appears. This is Bug ID 3 in our Bug List, and it is our highest priority.
In yesterday's post that announced the Beta 2 release, we also posted a procedure for working around the problem. We now know that that procedure does not work, so we've removed the link to that page.
We think that this is a symptom of your Mac not trusting an application that didn't come from the App Store, but as of this writing we're not even certain of that. We will continue to research the problem, and we will post a fix or a real workaround as soon as we can.