I've been having a terrible time with this, too, but here's how I fixed it to print on C paper:
Go to File>Page Setup, set the number of pages it will print to 1 horizontal, 1 vertical. Then click the Printer Setup button in the lower corner and set to landscape. Click OK and make sure the size button says 24.84? wide by 17.64? high (the actual printable area for C paper, at least on my printer), then print the thing using the standard VW printing command.
I hope that's useful to someone else out there.
