JDEV Application does not comeup after spalsh screen

Hi,
Interested in JDeveloper, I recently installed JDeveloper from OTN website and after install and the first start, It checked for udpates and Then I installed udpated (10.1.3.1.0). After that it asked me to rename some file, but I missed the step and then exited and restarted. After that the App never comes up and in the task manager I see the jdev.exe takes up 50% of the processor and does nothing.
How do I troubleshoot this. Is there a log that I can look into?
I do not see any support info or trouble shooting guide except this forum. Any help is appreciated.
Venkat V

having had a very similar experience on 10.1.2, I downloaded 10.1.3.1
I did install some extensions. I then started running a tutorial. switched off and went home.
next day Jdev wouldnt get past splash screen.
deleted entire jdeveloper folder/subfolder .. re extracted from original downloaded zip.
still won't get past the splash screen. running from console get the following:
java.lang.NullPointerException
at javax.swing.MultiUIDefaults.getUIError(MultiUIDefaults.java:117)
at javax.swing.UIDefaults.getUI(UIDefaults.java:721)
at javax.swing.UIManager.getUI(UIManager.java:860)
at javax.swing.JPanel.updateUI(JPanel.java:104)
at javax.swing.JPanel.<init>(JPanel.java:64)
at javax.swing.JPanel.<init>(JPanel.java:87)
at javax.swing.JPanel.<init>(JPanel.java:95)
at javax.swing.JRootPane.createGlassPane(JRootPane.java:482)
at javax.swing.JRootPane.<init>(JRootPane.java:313)
at javax.swing.JFrame.createRootPane(JFrame.java:247)
at javax.swing.JFrame.frameInit(JFrame.java:228)
at javax.swing.JFrame.<init>(JFrame.java:195)
at oracle.ide.IdeCore$StartupWindow.<init>(IdeCore.java:1450)
at oracle.ide.IdeCore.startupImpl(IdeCore.java:1075)
at oracle.ide.Ide.startup(Ide.java:674)
at oracle.ideimpl.Main.start(Main.java:49)
at oracle.ideimpl.Main.main(Main.java:25)
not sure what else to do

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