Thanks for input to solve this problem.

We have the same Problem on change from v10.2 to v11.2 and we solve it with your instruction.

 Hi Mike,

My software use UltraGrid very complex: Inherits, KeyActionMapping, ValueList, Dropdown... so I can reproduce  in new project. But when I edit binary layout file, I found the way to resolve:

Because Layout file contain version info, so I replace old version info to lastest version: 8.1 -> 8.3

Here my solution:Replace byte in binary layout file:

    Const mscShortVersion81 As String = "v8.1"
    Const mscShortVersion83 As String = "v8.3"
    Const mscLongVersion81 As String = "8.1.20081.1000"
    Const mscLongVersion83 As String = "8.3.20083.1009"

    Private bytShortVersion81() As Byte = encodeASCII.GetBytes(mscShortVersion81)
    Private bytShortVersion83() As Byte = encodeASCII.GetBytes(mscShortVersion83)

    Private bytLongVersion81() As Byte = encodeASCII.GetBytes(mscLongVersion81)
    Private bytLongVersion83() As Byte = encodeASCII.GetBytes(mscLongVersion83)

 Private Sub ConvertLayoutFile(ByVal fileName As String)
        Dim file As IO.FileStream = Nothing
        Try
            file = New IO.FileStream(fileName, IO.FileMode.Open)
            Dim bytLayout(file.Length - 1) As Byte
            file.Read(bytLayout, 0, bytLayout.Length)

            ReplaceByteArray(bytLayout, bytShortVersion81, bytShortVersion83)
            ReplaceByteArray(bytLayout, bytLongVersion81, bytLongVersion83)

            file.Position = 0
            file.Write(bytLayout, 0, bytLayout.Length)
            file.Flush()
        Catch ex As Exception
        Finally
            If file IsNot Nothing Then
                file.Close()
                file.Dispose()
            End If
        End Try
    End Sub

    Private Sub ReplaceByteArray(ByRef arrSource() As Byte, ByVal arrFrom() As Byte, ByVal arrTo() As Byte)
        Dim i, j As Integer
        Dim blnFound As Boolean = True
        Dim intFromLeng As Integer = arrFrom.Length

        For i = 0 To arrSource.Length - intFromLeng - 1
            blnFound = True
            j = 0
            While blnFound And j <= intFromLeng - 1
                blnFound = blnFound And (arrSource(i + j) = arrFrom(j))
                j += 1
            End While
        
            If blnFound Then
                For j = 0 To intFromLeng - 1
                    arrSource(i + j) = arrTo(j)
                Next
            End If
        Next
    End Sub

 My problem is resolved very well. Hope that no one meet this error.

 My god!

Hi Mike,

Thanks for your answer. Don't you see: "Exception: Object reference not set... "  in subject?

I view inner exception, that is NullReferenceException from LoadLayoutHelper.

In fact, layout file doesn't backwar compatible. I have try use UltraGrid 7.3 load layout UltraGrid, this exception still exist.

In history, version Infragistics 6.x doesn't have this error

If you try with your Project, You can see. Orelse, I will give you my project with my layout files.

Thanks