Error in Aceess form "Update or CancelUpdate without AddNew or Edit"

[tito]

I am trying to use "dwgthumbnail.ocx" to show a thumbnail of an AutoCAD
drawing in a MS Access form.

The form has a text box (DwgFilename) with a valid drawing name and
path.

When I open the form I get a thumbnail preview of the drawing for the
first record but as soon as I go to the next record I get the following
error:

Update or CancelUpdate without AddNew or Edit

Here is the code:

Private Sub DwgThumbnail1_Updated(Code As Integer)
On Error Resume Next
With DwgThumbnail1
.DwgFileName = [DwgFilename]
.Refresh
End With
End Sub

Any suggestions?

Thanks in advance
/Tito Salazar (MS Windows XP SP2, MS Access 2003, AutoCad LT 2006)