pdf problem

[TTT]

i can't open pdf -file after creating new one. i think it's some header problem, but i have no idea how to solve it.
end of cration code is:

.... PDF_end_page($p);

PDF_close($p);
$buf = PDF_get_buffer($p);
$len = strlen($buf);

/* i tried also with octet-stream */
//	header ("Content-type: application/octet-stream");
	header ("Content-type: application/pdf");
	header ("Content-length:".$len);		
	$thefile = "newPdf.pdf";
	header ("Content-Disposition: inline; filename=".$thefile);		

$fp2 = "../generated_pdfs/".$thefile;
copy("../generated_pdfs/temp.pdf",$fp2);

when i'm trying to open newPdf.pdf with Acrobat reader 6, i get error:
Adobe reader could not open newPdf.pdf because it's either not a supported file type or because file has been corrupted

[labelreader]

I'm having exactly the same problem. I'm using the FPDF library with an Apache server. It only happens for some output pages (seems to depend on the content), and it only happens on MSIE clients. I can display the PDF fine in Firefox for Windows, but an MSIE client running the same version of Acrobat claims the generated PDF file is "corrupt." If you find the cause, please let me know, too!

Thanks!