G'day,

I've got a vb.net 2.1 window forms application that works as expected in the
VS2005 debug environment.  However when I run the application under "Release"
configuration I get a weird error that crashes the application.

At the point of failure the application is doing the following logic.
1. Main form _Load event is firing.
2. User identity is being set via a commandline.arg option (bit of a cheat).
3. If a commandline.arg supplies a form name, then that forms
form.ShowDialog method fires.  
4. A fast shut down the application after that form is closed (still in the
mainForm_Load event) will then occur.

Windows Xp.sp 2 + service packs
VS2005 sp1
.net framework 2.0 + sp1

System.NullReferenceException was unhandled
 Message="Object reference not set to an instance of an object."
 Source="Microsoft.VisualBasic"
 StackTrace:
      at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.MainFormLoadingDone(Object sender, EventArgs e)
      at System.EventHandler.Invoke(Object sender, EventArgs e)
      at System.Windows.Forms.Form.OnLoad(EventArgs e)
      at System.Windows.Forms.Form.OnCreateControl()
      at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
      at System.Windows.Forms.Control.CreateControl()
      at System.Windows.Forms.Control.WmShowWindow(Message& m)
      at System.Windows.Forms.Control.WndProc(Message& m)
      at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
      at System.Windows.Forms.ContainerControl.WndProc(Message& m)
      at System.Windows.Forms.Form.WmShowWindow(Message& m)
      at System.Windows.Forms.Form.WndProc(Message& m)
      at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
      at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
      at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
      at System.Windows.Forms.SafeNativeMethods.ShowWindow(HandleRef hWnd,
Int32 nCmdShow)
      at System.Windows.Forms.Control.SetVisibleCore(Boolean value)
      at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
      at System.Windows.Forms.Control.set_Visible(Boolean value)
      at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
      at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason,
ApplicationContext context)
      at System.Windows.Forms.Application.Run(ApplicationContext context)
      at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
      at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
      at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
      at Iims.Gui.My.MyApplication.Main(String[] Args)

If I enable unmanaged code debugging in "release" configuration I stop at
the following line:
User32.dll
7E418734  mov         ecx,dword ptr fs:[18h]