I added just the true absolute path in place of the (realpath("/PDF/".$row_Recordset1['filename']) option that your mentioned.  I am still getting the same results either way, but the dialog box is no longer showing up after I made the last change.
Below is the requested code I think... 
  if ($RecipientEmail)     {
    $WA_MailObject = WAUE_AddRecipient($WA_MailObject,$RecipientEmail);
  }
  else      {
    //To Entries
  }
//Attachment Entries
  $WA_MailObject = WAUE_AddAttachment($WA_MailObject,"/home/abcdefg/public_html/PDF/".$row_getRecordset1['filename']."");

 














