In version 1.1.6 and higher of ImgWriter, the BufferResponse property is available to override ImgWriter's default behavior of setting the Response.Buffer property to false. Set this property as you would set the Response.Buffer property.
Set objImage = Server.CreateObject("SoftArtisans.ImageGen")
'--- This is like setting Response.Buffer = "true"
'--- except ImgWriter will not ignore the setting.
objImage.BufferResponse = "true"
Set objImage = Nothing
This property was added to ImgWriter to address an issue with Internet Explorer's handling of page refreshes. Please see the following KB article for more information: http://support.softartisans.com/kbview.aspx?ID=679