Upgrade to Netweaver causing problem while opening pdf file in the portal

After an upgrade to Netweaver 4.0, the following code for opening a pdf file constructed from a byte stream passed from an RFC fails.
Document doc = new Document(PageSize.A4);
javax.servlet.http.HttpServletResponse myResponse = request.getServletResponse(true);
myResponse.setHeader("Content-Disposition","attachment;filename=\"AIPDoc.pdf\"");
myResponse.setContentType("application/pdf");
ByteArrayOutputStream baosPdf = new ByteArrayOutputStream();
OutputStream os = myResponse.getOutputStream();
os.write(pdfResult);
PdfWriter.getInstance(doc, os);
It throws a "file not found error" on opening directly. However, if saved and viewed; it opens fine. I believe we need to specify the portal url in the filename but not sure.
Thanks,
Devina

Hi Devina,
We are also opening a pdf file constructed from a byte stream passed from an RFC. Our problem is that we are experiencing inconsistent results. The file appears to open on some PC workstations but not on others. When it doesn't work we simply get a blank screen in the window. Did you resolve your issue? If so, perhaps you can provide us with some suggestions for solving our problem.
Thank you,
Angie

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