Cannot open ANY of my old JSPs Jdeveloper is getting on my nerve!

For some reason I cannot open my old JSP files. I've been using Jdev 10.1.3 with latest service pack, but after installing Jdev Preview 10.1.3.1 and openning the project files in it, my JSPs stopped opening in Jdev 10.1.3. Since all my sources are in cvs - I re-checked out everything - still no luck.
Here is a stack trace in case somebody knows what is going on:
java.lang.NullPointerException
     at oracle.jdevimpl.webapp.model.content.DocumentInfoManager$XmlDocumentInfoImpl.<init>(DocumentInfoManager.java:360)
     at oracle.jdevimpl.webapp.model.content.DocumentInfoManager$XmlDocumentInfoImpl.<init>(DocumentInfoManager.java:351)
     at oracle.jdevimpl.webapp.model.content.DocumentInfoManager.getDocumentInfo(DocumentInfoManager.java:176)
     at oracle.jdevimpl.webapp.editor.html.HtmlEditor.getDocumentInfo(HtmlEditor.java:592)
     at oracle.jdevimpl.webapp.editor.AbstractWebAppEditor.createDocuments(AbstractWebAppEditor.java:1197)
     at oracle.jdevimpl.webapp.editor.AbstractWebAppEditor.open(AbstractWebAppEditor.java:393)
     at oracle.jdevimpl.webapp.editor.html.HtmlEditor.open(HtmlEditor.java:172)
     at oracle.jdevimpl.webapp.editor.jsp.JspEditor.open(JspEditor.java:113)
     at oracle.ideimpl.editor.EditorState.openEditor(EditorState.java:239)
     at oracle.ideimpl.editor.EditorState.createEditor(EditorState.java:147)
     at oracle.ideimpl.editor.EditorState.getOrCreateEditor(EditorState.java:90)
     at oracle.ideimpl.editor.SplitPaneState.canSetEditorStatePos(SplitPaneState.java:231)
     at oracle.ideimpl.editor.SplitPaneState.setCurrentEditorStatePos(SplitPaneState.java:194)
     at oracle.ideimpl.editor.TabGroupState.createSplitPaneState(TabGroupState.java:103)
     at oracle.ideimpl.editor.TabGroup.addTabGroupState(TabGroup.java:275)
     at oracle.ideimpl.editor.EditorManagerImpl.createEditor(EditorManagerImpl.java:1261)
     at oracle.ideimpl.editor.EditorManagerImpl.createEditor(EditorManagerImpl.java:1196)
     at oracle.ideimpl.editor.EditorManagerImpl.openEditor(EditorManagerImpl.java:1131)
     at oracle.ideimpl.editor.EditorManagerImpl.whenOpenEditor(EditorManagerImpl.java:2332)
     at oracle.ideimpl.editor.EditorManagerImpl.handleDefaultAction(EditorManagerImpl.java:1893)
     at oracle.ide.controller.ContextMenu.fireDefaultAction(ContextMenu.java:343)
     at oracle.ideimpl.explorer.BaseTreeExplorer.fireDefaultAction(BaseTreeExplorer.java:1504)
     at oracle.ideimpl.explorer.BaseTreeExplorer.dblClicked(BaseTreeExplorer.java:1841)
     at oracle.ideimpl.explorer.BaseTreeExplorer.mouseReleased(BaseTreeExplorer.java:1862)
     at oracle.ideimpl.explorer.CustomTree.processMouseEvent(CustomTree.java:176)
     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)
What is going on with Jdeveloper? I've used to be a huge fan of Jdeveloper, but now - instead of doing real development i have to spend a lot of time finding "workarounds" to Jdev behavior - not good

Once you open a project in a newer version of JDeveloper you can't open it again in the older version.
You might want to try checking-out a version of your code from before you upgraded.
One more option is to create a new project in 10.1.3.0 and then add the files manually.

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