[MacRuby-devel] RubyCocoa & MacRuby interaction?

I am getting rather desperate here :-( The initWithWindowNibName suddenly stopped working. It still works in a previous xcode project that I had, but I cannot create new MacRuby projects that use this method. Is there something scr*d-up on my machine? I am still on the checkbox problem and created an Obj-C xcode project that shows the correct working of the "state" operation. Then I created an exact copy (translation) in an xcode MacRuby project and now the initWithWindowNibName suddenly does not work anymore. I checked and double checked and triple checked all the usual caveats. Nothing. Has anybody here ever had something like this before? (and what was the solution?) Regards, Rien.