No matter what I do, the PDF files I create always come out 8.5 X 11 inches. I've set the desired output, which is 12.38 X 9.25 inches. But for some reason, I keep getting 8.5 X 11. My OS is Windows XP, and the issue arises no matter what program I try to create a pdf from.
I, too, am experiencing this phenomenon. My drawing is 11x17, but the printed PDF is half of the drawing on an 8.5x11 inch page. I get the selected page size if I pick one of the predefined sizes, but 11x17 is not on the list. Any custom size is printed as 8.5x11. I get the same behavior in portrait and landscape. This only happens while using Inkscape (so far). Word and Notepad print to the correct predefined or custom size. It happens under Windows XP SP3 and Windows 2000 SP4. Any hints I should send to the Inkscape folks?
OK - here's the workaround for Windows 7:
Open Devices and Printers
Single click on DoPDF
Click on Print Server Properties
Click the checkbox "Create New Form" in the dialog box that comes up
Enter a new name for the custom paper size
Enter measurements into bottom of dialog box and click OK
Now, when you print using DoPDF, you can select that paper size in the Paper/Size drop down list.