VS2013 crashes when you open up a form in the designer that contains a UserControl. The form will open if the UserControl does NOT contain any other controls, but will crash when it hosts other controls. Just one control will make it crash. Please see the attached project. The problem seems to have started after 1.3.6. The project will run OK, it’s just when you try to design the form that it will crash. We only tested this with VS2013.