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The exception in the title is thrown when I open a window in WPF, the strange thing is that this does not happen on my Windows 7 development machine nor does it happen when it is deployed on Windows 7. I only get this error on Windows XP, and only the second time that I open the window. Here is the code to open the window: ReportParametersWindow win = null; bool canOverWrite = _shownReports.Contains(rpt.FriendlyName); if (!(canOverWrite)) win = new ReportParametersWindow(rpt.FriendlyName, rpt.ReportParameters, canOverWrite); else win = new ReportParametersWindow(rpt.FriendlyName, (container.ParametersWindow as ReportParametersWindow).Controls, canOverWrite); win.ShowDialog(); And the XAML for the window: <Window xmlns:my="clr-namespace:MHA.Modules.Core.Controls;assembly=MHA.Modules.Core" x:Class="MHA.Modules.Reports.Views.ReportParametersWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Parameters" Height="500" Width="600" MinWidth="500" MaxHeight="500" Icon="/MHA.Modules.Reports;component/Images/Parameters.ico" SizeToContent="WidthAndHeight" WindowStartupLocation="CenterScreen" xmlns:odc="clr-namespace:Odyssey.Controls;assembly=Odyssey" Closed="Window_Closed"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="*"/> <RowDefinition Height="40"/> </Grid.RowDefinitions> <ScrollViewer Grid.Row="0" Name="ScrollViewer1" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" CanContentScroll="True"> <StackPanel Name="ParameterStack"> <my:LocationCtl Text="Parameters for report - " Name="loc"/> </StackPanel> </ScrollViewer> <Grid Grid.Row="1"> <Grid.ColumnDefinitions> &l

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