Thanks, I still had no luck so as I was using Scene builder v2.0 I tried v1.1 and recreated the same project from scratch and it worked. I then had a look at the fxml file(s) and they were different. The stylesheet tag was different. I have zipped the 2 fxml files if you want to look at them.. The 'test.fxml' was v1.1 and 'test2.fxml' was with v2.0