Hi,
Using Fireworks CS5, when exporting a PDF using File>Export - the PDF document size is wrong for resolutions other than 72dpi.
If I make a 300dpi graphic, 10cm x 20cm and export as a pdf - it becomes a 41.7cm x 83.3cm PDF document. It grows 4 times (which looks similar to the ratio 72/300 px).
If you are only working in 72dpi - it is fine. But that resolution is no good for printing.
But if you need to send something to the printers, and they only accept PDF - you are stuffed. In my case today, I'm trying to upload a pdf onto a disc copying website for digital processing.
I've had this problem for many years - since CS4. Raised it a few times with adobe support- but didn't get a solution.
I'm not talking about the display (edit>preferences>page display>resolution). I'm talking about Document size.
(To see the real document size in acrobat - I use file>print and set the page scale to "none". Acrobat then displays the Document size)
To work around this bug, I've had to buy a 3rd party tool to resize my PDF's (verypdf ). I cannot find a way to easily resize the document in Acrobat 9 either 
.
Cheers