Opening the editor on two of my files, I am presented with a stack trace rather then the editor. I will continue to try and pin down what in the file is causing the error, but an upgrade from the Oct-07-2010 snapshot did not fix the problem. Let me know if there is anything I can provide which will help. I think I have the right branch selected, but I am not sure.

Versions:
Eclipse IDE for Java Developers 1.2.2.20100216-1730 epp.package.java (Build id: 20100218-1602)
Scala IDE for Eclipse 1.0.0.201011080225 org.scala-ide.sdt.feature.feature.group (http://download.scala-ide.org/nightly-update-master-2.8.0.final)
JDT Weaving for Scala 1.0.0.201011080225 org.scala-ide.sdt.weaving.feature.feature.group

Stacktrace:

java.lang.Error: typeConstructor inapplicable for <none>
at scala.tools.nsc.symtab.SymbolTable.abort(SymbolTable.scala:33)
at scala.tools.nsc.symtab.Symbols$Symbol.typeConstructor(Symbols.scala:894)
at scala.tools.nsc.symtab.Symbols$TypeSymbol$$anonfun$9.apply(Symbols.scala:1818)
at scala.tools.nsc.symtab.Symbols$TypeSymbol$$anonfun$9.apply(Symbols.scala:1818)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:206)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:206)
at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:61)
at scala.collection.immutable.List.foreach(List.scala:45)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:206)
at scala.collection.immutable.List.map(List.scala:45)
at scala.tools.nsc.symtab.Symbols$TypeSymbol.tpe(Symbols.scala:1818)
at scala.tools.eclipse.javaelements.ScalaOverrideIndicatorBuilder$OverrideIndicatorBuilderTraverser.traverse(ScalaOverrideIndicatorBuilder.scala:36)
at scala.reflect.generic.Trees$Traverser$$anonfun$traverseTrees$1.apply(Trees.scala:566)
at scala.reflect.generic.Trees$Traverser$$anonfun$traverseTrees$1.apply(Trees.scala:566)
at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:61)
at scala.collection.immutable.List.foreach(List.scala:45)
at scala.reflect.generic.Trees$Traverser.traverseTrees(Trees.scala:566)
at scala.reflect.generic.Trees$Traverser$$anonfun$traverse$1.apply$mcV$sp(Trees.scala:465)
at scala.reflect.generic.Trees$Traverser.atOwner(Trees.scala:581)
at scala.reflect.generic.Trees$Traverser.traverse(Trees.scala:464)
at scala.tools.nsc.ast.Trees$Traverser.traverse(Trees.scala:881)
at scala.tools.eclipse.javaelements.ScalaOverrideIndicatorBuilder$OverrideIndicatorBuilderTraverser.traverse(ScalaOverrideIndicatorBuilder.scala:57)
at scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anonfun$createOverrideIndicators$1.apply(ScalaCompilationUnit.scala:179)
at scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anonfun$createOverrideIndicators$1.apply(ScalaCompilationUnit.scala:175)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply$mcV$sp(Cached.scala:22)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply(Cached.scala:21)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply(Cached.scala:21)
at scala.tools.eclipse.util.Cached$class.locked(Cached.scala:83)
at scala.tools.eclipse.util.Cached$class.apply(Cached.scala:20)
at scala.tools.eclipse.ScalaPresentationCompiler$CachedCompilerResult.apply(ScalaPresentationCompiler.scala:64)
at scala.tools.eclipse.ScalaPresentationCompiler.withCompilerResult(ScalaPresentationCompiler.scala:99)
at scala.tools.eclipse.ScalaProject$$anonfun$withCompilerResult$1.apply(ScalaProject.scala:367)
at scala.tools.eclipse.ScalaProject$$anonfun$withCompilerResult$1.apply(ScalaProject.scala:366)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply$mcV$sp(Cached.scala:22)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply(Cached.scala:21)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply(Cached.scala:21)
at scala.tools.eclipse.util.Cached$class.locked(Cached.scala:83)
at scala.tools.eclipse.util.Cached$class.apply(Cached.scala:20)
at scala.tools.eclipse.ScalaProject$$anon$1.apply(ScalaProject.scala:40)
at scala.tools.eclipse.ScalaProject.withPresentationCompiler(ScalaProject.scala:362)
at scala.tools.eclipse.ScalaProject.withCompilerResult(ScalaProject.scala:366)
at scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.withCompilerResult(ScalaCompilationUnit.scala:58)
at scala.tools.eclipse.javaelements.ScalaSourceFile.withCompilerResult(ScalaSourceFile.scala:40)
at scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.createOverrideIndicators(ScalaCompilationUnit.scala:175)
at scala.tools.eclipse.javaelements.ScalaSourceFile.createOverrideIndicators(ScalaSourceFile.scala:40)
at scala.tools.eclipse.contribution.weaving.jdt.hierarchy.HierarchyAspect.ajc$around$scala_tools_eclipse_contribution_weaving_jdt_hierarchy_HierarchyAspect$2$b42b0558(HierarchyAspect.aj:116)
at org.eclipse.jdt.internal.ui.javaeditor.OverrideIndicatorManager.updateAnnotations(OverrideIndicatorManager.java:170)
at org.eclipse.jdt.internal.ui.javaeditor.OverrideIndicatorManager.<init>(OverrideIndicatorManager.java:141)
at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.installOverrideIndicator(JavaEditor.java:3457)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.installOverrideIndicator(CompilationUnitEditor.java:1382)
at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.internalDoSetInput(JavaEditor.java:2568)
at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.doSetInput(JavaEditor.java:2525)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.doSetInput(CompilationUnitEditor.java:1371)
at org.eclipse.ui.texteditor.AbstractTextEditor$19.run(AbstractTextEditor.java:3116)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
at org.eclipse.jface.window.ApplicationWindow$1.run(ApplicationWindow.java:759)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.jface.window.ApplicationWindow.run(ApplicationWindow.java:756)
at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2579)
at org.eclipse.ui.texteditor.AbstractTextEditor.internalInit(AbstractTextEditor.java:3134)
at org.eclipse.ui.texteditor.AbstractTextEditor.init(AbstractTextEditor.java:3161)
at org.eclipse.ui.internal.EditorManager.createSite(EditorManager.java:798)
at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:644)
at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:462)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:286)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2857)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2762)
at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2754)
at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2705)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2701)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2685)
at org.eclipse.ui.actions.OpenWithMenu.openEditor(OpenWithMenu.java:344)
at org.eclipse.ui.actions.OpenWithMenu$2.handleEvent(OpenWithMenu.java:192)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1176)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3493)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3112)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
at org.eclipse.equinox.launcher.Main.main(Main.java:1287)