NullPointerException re-loading WSDL

I've read the recent bug reports and a fix to a similar problem was submitted a short while ago, but I am still getting this problem on both windows and Linux, regular and pro and on 4.0.0 and 4.0.1. I loaded my WSDL into the project a few months ago. At the time I didn't see any error messages, but I wasn't trolling through the logs, so there might have been something I missed at the time. I'm able to send requests and do basic validation on the responses. I first noticed there was a problem when I tried to turn on schema compliance and got a NullPointerException. Digging deeper, it seems that SOAPui can't find in its cache one of imported WSDLs of the WSDL I'm validating the response against so it tries to reload it. This results in the following error.

Note that modifying the WSLD/XSDs or flattening their file hierarchy are not options for us. Also, other tools I'm using have managed to read in these WSDL without errors.

Wed Oct 26 15:45:15 EDT 2011:ERROR:java.lang.Exception: java.lang.NullPointerException
java.lang.Exception: java.lang.NullPointerException
at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionContext.load(AbstractDefinitionContext.java:162)
at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionContext.load(AbstractDefinitionContext.java:115)
at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionContext.getSchemaTypeSystem(AbstractDefinitionContext.java:319)
at com.eviware.soapui.impl.support.components.RequestXmlDocument.getTypeSystem(RequestXmlDocument.java:77)
at com.eviware.soapui.support.editor.views.xml.outline.XmlOutlineEditorView.setXml(SourceFile:306)
at com.eviware.soapui.support.editor.views.AbstractXmlEditorView.update(AbstractXmlEditorView.java:75)
at com.eviware.soapui.support.editor.views.AbstractXmlEditorView.activate(AbstractXmlEditorView.java:66)
at com.eviware.soapui.support.editor.Editor$InputTabsChangeListener.stateChanged(Editor.java:228)
at javax.swing.JTabbedPane.fireStateChanged(Unknown Source)
at javax.swing.JTabbedPane$ModelListener.stateChanged(Unknown Source)
at javax.swing.DefaultSingleSelectionModel.fireStateChanged(Unknown Source)
at javax.swing.DefaultSingleSelectionModel.setSelectedIndex(Unknown Source)
at javax.swing.JTabbedPane.setSelectedIndexImpl(Unknown Source)
at javax.swing.JTabbedPane.setSelectedIndex(Unknown Source)
at javax.swing.plaf.basic.BasicTabbedPaneUI$Handler.mousePressed(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at com.ibm.wsdl.xml.WSDLReaderImpl.parseImport(Unknown Source)
at com.ibm.wsdl.xml.WSDLReaderImpl.parseDefinitions(Unknown Source)
at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source)
at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source)
at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source)
at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source)
at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source)
at com.eviware.soapui.impl.wsdl.support.wsdl.WsdlInterfaceDefinition.load(WsdlInterfaceDefinition.java:52)
at com.eviware.soapui.impl.wsdl.support.wsdl.WsdlContext.loadDefinition(WsdlContext.java:66)
at com.eviware.soapui.impl.wsdl.support.wsdl.WsdlContext.loadDefinition(WsdlContext.java:30)
at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionContext.cacheDefinition(AbstractDefinitionContext.java:268)
at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionContext.access$400(AbstractDefinitionContext.java:44)
at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionContext$Loader.construct(AbstractDefinitionContext.java:235)
at com.eviware.soapui.support.swing.SwingWorkerDelegator.construct(SwingWorkerDelegator.java:46)
at com.eviware.soapui.support.swing.SwingWorker$2.run(SwingWorker.java:149)
at java.lang.Thread.run(Unknown Source)