file does not begin with %PDF - BinaryWrite

[TrailBlazer]

Hi - Been struggling over this issue for a long while. We store PDF's
in our SQL Server database. And I do a BinaryWrite to display the PDF.
It works for me without issue, on FireFox, IE, and Opera! But we are
receiving feedback that some users are receiving the file does not
begin with %PDF message.

ExecString = "spwEcoTrackUser " & Session("EcoUserID") & ",'coupon',"
& ID
set dbConn = Server.CreateObject("ADODB.Command")
dbConn.ActiveConnection = conn
dbConn.CommandText = ExecString
dbConn.Execute

' writes out the PDF
Response.ContentType = rs("CouponContentType")
Response.BinaryWrite rs("CouponData")

I have seen several posts about this issue, but no true solution. Can
anyone help?

THANKS!!!!