I am trying to make a Document based MacRuby application. I create the new project in Xcode4 (4.0.2) and immediately select build and run. The application starts but there is no "Untitled" window and the File->New and File->Open menu options are greyed out. Following the same sequence of actions except choosing an Objective-C based application, the "Untitled" Window appears and the menu options are active. I have compared the project contents, the xib files (including File Owners and First Responders) and linked frameworks and can find no difference that would explain the different operation. It would seem that there is some problem with NSDocumentController in the MacRuby version. It is either not there or has been added properly to the responder chain. Am I missing something? Or is this a defect? Has anyone else encountered this and found a work around? Andy Stechishin