After applying new updates, problems with opening SQL*Worksheet window

SQL Developer version 1.2.0 Build MAIN-29.98
OS Windows XP with Service Pack 2.
Problem:
Connection to database works fine.
Opening SQL*Worksheet errors with below error:
java.lang.IllegalAccessError: tried to access class oracle.ide.net.IdeURLStreamHandler from class oracle.ide.net.URLFileSystem$1
     at oracle.ide.net.URLFileSystem$1.createURLStreamHandler(URLFileSystem.java:87)
     at oracle.ide.boot.URLStreamHandlerFactoryQueue.createURLStreamHandler(URLStreamHandlerFactoryQueue.java:119)
     at java.net.URL.getURLStreamHandler(URL.java:1104)
     at java.net.URL.<init>(URL.java:393)
     at java.net.URL.<init>(URL.java:283)
     at oracle.ide.net.URLFactory.newURL(URLFactory.java:636)
     at oracle.ide.net.URLFactory.newURL(URLFactory.java:136)
     at oracle.dbtools.sqlworksheet.sqlview.SqlEditorNode.<init>(SqlEditorNode.java:65)
     at oracle.dbtools.sqlworksheet.sqlview.SqlEditor.openNewEditor(SqlEditor.java:1973)
     at oracle.dbtools.sqlworksheet.sqlview.SqlEditor.openNewEditor(SqlEditor.java:2032)
     at oracle.dbtools.sqlworksheet.sqlview.SqlEditor.openNewEditor(SqlEditor.java:2050)
     at oracle.dbtools.sqlworksheet.sqlview.SqlEditorWizard.invoke(SqlEditorWizard.java:114)
     at oracle.ide.wizard.WizardManager.invokeWizard(WizardManager.java:310)
     at oracle.dbtools.sqlworksheet.sqlview.SqlEditorController.toolbarAction(SqlEditorController.java:1013)
     at oracle.dbtools.sqlworksheet.sqlview.SqlEditorController.handleEvent(SqlEditorController.java:562)
     at oracle.ide.controller.IdeAction.performAction(IdeAction.java:551)
     at oracle.ide.controller.IdeAction$2.run(IdeAction.java:804)
     at oracle.ide.controller.IdeAction.actionPerformedImpl(IdeAction.java:823)
     at oracle.ide.controller.IdeAction.actionPerformed(IdeAction.java:521)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
     at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
     at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1000)
     at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1041)
     at java.awt.Component.processMouseEvent(Component.java:5488)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
     at java.awt.Component.processEvent(Component.java:5253)
     at java.awt.Container.processEvent(Container.java:1966)
     at java.awt.Component.dispatchEventImpl(Component.java:3955)
     at java.awt.Container.dispatchEventImpl(Container.java:2024)
     at java.awt.Component.dispatchEvent(Component.java:3803)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
     at java.awt.Container.dispatchEventImpl(Container.java:2010)
     at java.awt.Window.dispatchEventImpl(Window.java:1774)
     at java.awt.Component.dispatchEvent(Component.java:3803)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Anyone else facing this problem? Any solution to this problem?
Thanks,
Raj.

I believe (hope) you're saying that you can not update SQL Developer to the latest release via "Check for Updates".
My problem is that I get this error when running "Check for Updates" on a third party extension and not Oracle updates.
I did a fresh install and ran the update and it will always give me the error. It's easily reproducible. Although, the second restart will fix the problem I'm concerned that this will give the impression that the extension caused the problem.

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