I was in the process of building, then clicked on another file tab to show that file when the crash occurred. Build259, VS2003 JetBrains.ReSharper.Util.InternalErrorException: Object reference not set to an instance of an object. An exception has occurred ---> System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.VisualStudio.TextManager.Interop.IVsTextStreamMarker.SetBehavior(UInt32 dwBehavior) at JetBrains.ReSharper.TextControl.Markup.VSIntegration.VSHighlighter.UpdateMarkerState() in c:\Agent\work\ReSharper2.0\src\VSAddin\src\TextControl\Markup\VSTextControlMarkup.cs:line 100 at JetBrains.ReSharper.TextControl.Markup.VSIntegration.VSTextControlMarkup.OnVSDocumentImplementationSwitch(Object sender, EventArgs e) in c:\Agent\work\ReSharper2.0\src\VSAddin\src\TextControl\Markup\VSTextControlMarkup.cs:line 38 at JetBrains.ReSharper.Editor.VSIntegration.VSDocument.SetDocumentOperationsHandler(IDocumentOperationsHandler value) in c:\Agent\work\ReSharper2.0\src\VSAddin\src\Editor\VSDocument.cs:line 90 at JetBrains.ReSharper.Editor.VSIntegration.VSDocument.OnOpenInEditor(IVsTextStream textStream) in c:\Agent\work\ReSharper2.0\src\VSAddin\src\Editor\VSDocument.cs:line 57 at JetBrains.ReSharper.Editor.VSIntegration.VSDocumentManager.OnRegisterTextBuffer(VsTextBufferData textBufferData) in c:\Agent\work\ReSharper2.0\src\VSAddin\src\Editor\VSDocumentManager.cs:line 415 at JetBrains.ReSharper.Editor.VSIntegration._OnAfterFirstDocumentLockDelegatesClass._OnAfterFirstDocumentLockDelegate151() in c:\Agent\work\ReSharper2.0\src\VSAddin\src\Editor\VSDocumentManager.cs:line 701 at JetBrains.ReSharper.Shell.UIApplicationShell.InvokePendingActions() in c:\Agent\work\ReSharper2.0\src\Shell\src\UIApplicationShell.cs:line 741 — End of inner exception stack trace — at JetBrains.ReSharper.Util.Logger.LogExceptionEx(Exception, String, Boolean) in c:\Agent\work\ReSharper2.0\src\Util\src\Logger.cs:line 327 column 9 at JetBrains.ReSharper.Util.Logger.LogException(Exception) in c:\Agent\work\ReSharper2.0\src\Util\src\Logger.cs:line 339 column 5 at JetBrains.ReSharper.Shell.UIApplicationShell.InvokePendingActions() in c:\Agent\work\ReSharper2.0\src\Shell\src\UIApplicationShell.cs:line 749 column 13 at JetBrains.ReSharper.Shell.UIApplicationShell.InvokeReentrantSafe(Action) in c:\Agent\work\ReSharper2.0\src\Shell\src\UIApplicationShell.cs:line 728 column 5 at JetBrains.ReSharper.Editor.VSIntegration.VSDocumentManager.QueueAction(Action) in c:\Agent\work\ReSharper2.0\src\VSAddin\src\Editor\VSDocumentManager.cs:line 1071 column 5 at JetBrains.ReSharper.Editor.VSIntegration.VSDocumentManager.OnAfterFirstDocumentLock(UInt32, UInt32, UInt32, UInt32) in c:\Agent\work\ReSharper2.0\src\VSAddin\src\Editor\VSDocumentManager.cs:line 678 column 9