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I have not found a precise recipe how to reproduce it. But it seem that it`s related with this behavior (bug) - create a new form - use CardLayout - put JButton inside, cut it and paste it - now you the form window doesn`t accept mouse events ( and after some playing the exception occurs. I have seen the exception also for GridLayout but not for BorderLayout java.lang.InternalError: RAD Node Null at com.netbeans.developer.modules.loaders.form.FormManager2$ManagerMouseAdapter.mousePressed(FormManager2.java:1035) at com.netbeans.developer.modules.loaders.form.FormManager2$MouseProcessor.mousePressed(FormManager2.java:872) at com.netbeans.developer.modules.loaders.form.LightweightLayer$1.mousePressed(LightweightLayer.java:47) at java.awt.Component.processMouseEvent(Component.java:3157) at java.awt.Component.processEvent(Component.java:2999) at java.awt.Component.dispatchEventImpl(Component.java:2394) at java.awt.Component.dispatchEvent(Component.java:2307) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2043) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:1821) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1730) at java.awt.Container.dispatchEventImpl(Container.java:1022) at java.awt.Window.dispatchEventImpl(Window.java:749) at java.awt.Component.dispatchEvent(Component.java:2307) at java.awt.EventQueue.dispatchEvent(EventQueue.java:287) at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:92) at java.awt.EventDispatchThread.run(EventDispatchThread.java:83)
*** Bug 4364 has been marked as a duplicate of this bug. ***
Priority is changed to P4 (normal).
Resolved for 3.3.x or earlier, no new info since then -> closing.