NPE when start up JDeveloper when choose Studio Developer Role

JDeveloper was not responding. I closed the process from Task Manager. Restarted my PC. When I try to start up JDeveloper again with Studio Developer Role again, I keep on getting this NPE in Feed Back Reporting Tool, and JDeveloper is hanging, no respond. It is totally not usable. Please help.
JDeveloper Version 12.1.2.0.0
Title: NPE in o.javatools.internal.ui.EventQueryWrapper:169
Uncaught exception
java.lang.NullPointerException
com.oracle.jdeveloper.nbwindowsystem.NbDockStation.setDockableVisible(NbDockStation.java:391)
com.oracle.jdeveloper.nbwindowsystem.NbDockStation.activateDockable(NbDockStation.java:444)
com.oracle.jdeveloper.nbwindowsystem.NbDockStation.onWindowSystemStarted(NbDockStation.java:566)
com.oracle.jdeveloper.nbwindowsystem.Installer$1.afterLoad(Installer.java:49)
org.netbeans.core.windows.WindowManagerImpl.fireEvent(WindowManagerImpl.java:1940)
org.netbeans.core.windows.WindowSystemImpl.load(WindowSystemImpl.java:83)
org.netbeans.core.GuiRunLevel$InitWinSys.run(GuiRunLevel.java:234)
j.a.event.InvocationEvent.dispatch(InvocationEvent.java:209)
j.a.EventQueue.dispatchEventImpl(EventQueue.java:641)
j.a.EventQueue.access$000(EventQueue.java:84)
j.a.EventQueue$1.run(EventQueue.java:602)
j.a.EventQueue$1.run(EventQueue.java:600)
j.security.AccessController.doPrivileged(Native Method)
j.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
j.a.EventQueue.dispatchEvent(EventQueue.java:611)
o.javatools.internal.ui.EventQueueWrapper._dispatchEvent(EventQueueWrapper.java:169)
o.javatools.internal.ui.EventQueueWrapper.dispatchEvent(EventQueueWrapper.java:151)
j.a.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
j.a.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
j.a.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
j.a.EventDispatchThread.run(EventDispatchThread.java:122)

You can try to revenge your systemxx.xx.xx folder and then restart jdev. Jdev then behaves like it is started the first time.
To find the folder check out http://tompeez.wordpress.com/2011/08/13/how-to-find-and-reset-the-system11-x-x-x-folder-for-a-jdeveloper-installation/
Timo

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''FredMcD [[#answer-698567|said]]''
<blockquote>
You are talking about the whole screen, not just the Firefox window, yes?
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</blockquote>
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