I started a GWT project and added some widgets to the form. Everything worked fine.
Then, all of a sudden, the widgets disappeared, that is, they are not visible anymore. When I click on a spot in the screen where I know there is a widget , it is showed in the Properties and I can use the context menu on it. But I still have a blank screen.
When I create a new GWT project, every widget I add is visible again. It must be something with the first project. Some option or a key I pressed without knowing??