My Blend evaluation lic expired, maybe, 2 months ago. Now, my company has bought new licenses. First time I've tried to open the solution (that's running without problem on Visual Studion) on Blend, I find the next error in all my XAML's:
Spanish Message: No se admite el tipo [Tipo] en los proyectos Windows Presentation Foundation (WPF)
On english, it could be: [Type] (it could be UserControl, Grid, Canvas...) is not allowed in WPF projects.
With my evaluation Lic, I hadn't this problem.