Update a data bound list box

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VB

WPF

LINQ

I have a section of code that fires when a check box is checked/unchecked. The check box is going to be used to narrow down a listbox that is data bound. One item in the data is a link to an png image which shows correctly when the application first initializes. In the code below, I get a "Initialization of 'System.Windows.Media.Imaging.BitmapImage' threw an exception" exception every time.

    Private Sub chkShowCurrent_Click(sender As Object, e As RoutedEventArgs) Handles chkShowCurrent.Click
    Dim o As ObjectDataProvider
    Dim xDoc = XDocument.Load(sFileName)

    If chkShowCurrent.IsChecked = False Then
        'MsgBox("false")
    End If

    If chkShowCurrent.IsChecked = True Then
        'MsgBox("true")
        Dim OnlyCurrent = From job In xDoc.Root.Descendants("Job")
                          Where job.Element("Status").Value = "a-current"
                          Order By job.Element("Status").Value, job.Element("Rush").Value, Convert.ToDateTime(job.Element("DateOut").Value)
                          Select job

        lstJobs.ItemsSource = OnlyCurrent

    End If
    lstJobs.Items.Refresh()
    o = FindResource("jobs")
    o.Refresh()
End Sub

I had originally thought that the lstjobs.items.refresh was the issue, but the exception doesn't popup until after End Sub has been reached. I have tried adding a breakpoint to the code at the checkbox code and step through the code, but the answer still eludes me. Can anyone tell me where my error is?

Public Property Artwork() As String
Get
    Return _Artwork
End Get
Set(ByVal value As String)
    If value = String.Empty Then value = "images\Untitled.png"

    If My.Computer.FileSystem.FileExists("\\ARTSTATION\Users\Public\XML Job Board\" & value) Then
        value = "\\ARTSTATION\Users\Public\XML Job Board\" & value
    Else
        value = "\\ARTSTATION\Users\Public\XML Job Board\images\Untitled.png"
    End If
    _Artwork = value
End Set

The xml element is formated as image\GUID.png, thus necessitating the need to add the full path at runtime.

I had originally explored this as the issue and changed the XML to contain the full path and commented out the need for adding the full path in the properties, but this yielded the same results.