In the Microsoft.Practices.RecipeFramework.VisualStudio.dll in Microsoft.Practices.RecipeFramework.VisualStudio.Templates.VszWizard.FindAddItem() is the following code:
state["WizardType"] = context[0];
state["ProjectName"] = ((ProjectItems) context[2]).ContainingProject.UniqueName;
state["ProjectItems"] = context[2];
state["LocalDirectory"] = context[3];
state["ItemName"] = context[4];
state["InstallationDirectory"] = context[5];
state["Silent"] = context[5];
Notice the last two lines both use context[5]. The last one should use context.