WPF app referencing another WPF assembly (dll) not starting in Release mode

Hi,

My WPF app references another WPF assembly compiled as class library (dll).  My WPF class library has only one simple class to present a Login window where user authenticates before the main WPF app shows up. 

The problem is that when I run the debug version of main WPF app, it works fine and shows the initial Login window followed by main app window.  But when I run the Release version, it shows the Login window but then main app doesn't show up. I have"Copy Local" set to True in referenced assembly properties and I can also see the Login assembly copied to Release folder. I referenced this assembly both as a dll and as a project in my main WPF app, but no change.  Also, both my main WPF app and the assembly project are in the same VS 2012 solution.  When I run the Release version and monitor the task manager, my main app executable just disappears after clicking on Login window, which doesn't happen in Debug mode.

Following is code of OCPassword and MainWindow components:

OCPassword.xaml

<Window x:Class="OCLogin.OCPassword"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        WindowStartupLocation="CenterScreen"
        AllowsTransparency="True"
        Background="Transparent"
        WindowStyle="None"
        SizeToContent="WidthAndHeight"
        FocusManager.FocusedElement="{Binding ElementName=txtUserName}"><Window.Resources><Style TargetType="Label"><Setter Property="Margin"
              Value="4"></Setter></Style><Style TargetType="TextBox"><Setter Property="Margin"
              Value="4"></Setter><Setter Property="MinWidth"
              Value="200"></Setter><Setter Property="HorizontalAlignment"
              Value="Left"></Setter></Style><Style TargetType="PasswordBox"><Setter Property="Margin"
              Value="4"></Setter><Setter Property="MinWidth"
              Value="200"></Setter><Setter Property="HorizontalAlignment"
              Value="Left"></Setter></Style><Style TargetType="Button"><Setter Property="Margin"
              Value="6"></Setter><Setter Property="Padding"
              Value="4"></Setter><Setter Property="MinWidth"
              Value="50"></Setter></Style></Window.Resources><Border CornerRadius="10"
          BorderBrush="Gray"
          BorderThickness="3"
          Margin="24"
          Padding="4"><Border.Background><LinearGradientBrush><GradientStop Color="White" Offset="0" /><GradientStop Color="LightGreen" Offset="0.5" /><GradientStop Color="White" Offset="1" /></LinearGradientBrush></Border.Background><Grid><Grid.ColumnDefinitions><ColumnDefinition Width="60" /><ColumnDefinition Width="100" /><ColumnDefinition Width="*" /></Grid.ColumnDefinitions><Grid.RowDefinitions><RowDefinition /><RowDefinition /><RowDefinition /><RowDefinition /></Grid.RowDefinitions><StackPanel Grid.Column="0"
                  Grid.Row="0"
                  Grid.RowSpan="3"><Image Name="imgKey"
               Margin="8"
               Source="./ocsetngs.ico"><Image.Effect><DropShadowEffect Color="Gray"
                              Opacity=".50"
                              ShadowDepth="8" /></Image.Effect></Image></StackPanel><Label Grid.Column="1"
             Grid.Row="0"
             Grid.ColumnSpan="2"
             FontSize="18"
             Margin="10">Please Login To Access This Application</Label><Label Grid.Column="1"
             Grid.Row="1">User Name</Label><TextBox Grid.Column="2"
               Grid.Row="1"
               ToolTip="Enter Your User Name"
               Name="txtUserName" /><Label Grid.Column="1"
             Grid.Row="2">Password</Label><PasswordBox Grid.Column="2"
                   Grid.Row="2"
                   ToolTip="Enter Your Password"
                   Name="txtPassword" /><StackPanel Grid.Column="2"
                  Grid.Row="3"
                  Margin="10"
                  HorizontalAlignment="Center"
                  Orientation="Horizontal"><Button Name="btnCancel"
                IsCancel="True"
                Content="Cancel"
                Click="btnCancel_Click"><Button.Effect><DropShadowEffect Color="Gray"
                              Opacity=".50"
                              ShadowDepth="8" /></Button.Effect></Button><Button Name="btnLogin"
                IsDefault="True"
                Content="Login"
                Click="btnLogin_Click"><Button.Effect><DropShadowEffect Color="Gray"
                              Opacity=".50"
                              ShadowDepth="8" /></Button.Effect></Button></StackPanel></Grid></Border></Window>

OCPassword.xaml.cs

namespace OCLogin
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class OCPassword : Window
    {
        public OCPassword()
        {
            InitializeComponent();
        }

        private void btnCancel_Click(object sender, RoutedEventArgs e)
        {
            DialogResult = false;
            this.Close();
        }

        private void btnLogin_Click(object sender, RoutedEventArgs e)
        {
            // Write code here to authenticate user
            // If authenticated, then set DialogResult=true
            DialogResult = true;
            this.Close();
        }
    }
}

App.xaml (Main WPF App)

<Application x:Class="OCSetngs.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            Exit="Application_Exit" Startup="Application_Startup"><!-- StartupUri="MainWindow.xaml" --><Application.Resources></Application.Resources></Application>

App.xaml.cs (Main WPF App)  

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Windows;
using OCLogin;

namespace OCSetngs
{
    public partial class App : Application
    {
        private void Application_Exit(object sender, ExitEventArgs e)
        {
            OCStatics.DB.CleanupDB(true);
        }

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            try
            {
                //Disable shutdown when the Login dialog closes
                Current.ShutdownMode = ShutdownMode.OnExplicitShutdown;
                OCPassword pwd = new OCPassword();
                if (pwd.ShowDialog() == true)
                {
                    MainWindow mainWindow = new MainWindow();
                    //Re-enable normal shutdown mode.
                    Current.ShutdownMode = ShutdownMode.OnMainWindowClose;
                    Current.MainWindow = mainWindow;
                    mainWindow.Show();
                }
                else
                {
                    MessageBox.Show("Unable to load data.", "Error", MessageBoxButton.OK);
                    Current.Shutdown(0);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}

Please help.

Thanks.