I have a normal WPF MVVM-Light application, that I tried opening in Blend (first time I used Blend for Visual Studio 2012 on my Windows 8 machine).
However, I'm not able to open the Design View, which pretty much renders Blend useless.
One issue I read was that it happens when your application's Output Type is set to Console, which isn't the case for me. Anyone else seen this?
This appears to be the default Blend behavior when Blend does not support the .NET framework version that a project is configured to target. You can resolve this by opening the project in VS, opening the project properties(Alt-Enter), and changing the target framework to a supported version. For example, as of my writing this, Blend does not support .NET 4.5.2. You must convert it to 4.5.1 (c.f. http://connect.microsoft.com/VisualStudio/feedbackdetail/view/934732/blend-for-visual-studio-2013-does-not-render-the-design-view-with-net-framework-4-5-2)
Apparantly, Blend included in VS2012 only supports Windows 8 Apps.
However, there's a preview been released for Blend + Sketchflow that allows other platforms here :
http://www.microsoft.com/en-us/download/details.aspx?id=30702