I have an application that run without problem on many machines (including ones with XP home edition).  That is except for one person with a netbook using windows XP.  He gets the following error when the XamRibbon is initialized in the main program.

Message: Initialization of Infragistics.Windows.Ribbon.ButtonTool threw an exception.
Data: System.Collections.ListDictionaryInternal
Source: PresentationFramework
StackTrace:    at System.Windows.Markup.XamlReader.RewrapException(Exception e, IXamlLineInfo lineInfo, Uri baseUri)
   at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
   at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
   at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
   at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
   at CarlinSoftware.ChartAnalysis.CSChartAnalysis.InitializeComponent()
   at CarlinSoftware.ChartAnalysis.CSChartAnalysis..ctor()
TargetSite: Void RewrapException(System.Exception, System.Xaml.IXamlLineInfo, System.Uri)

Is there anything is all of your bugs reports that could explain what is happening and how to fix it?