I purchased a used 4800 last November and ran sheets through it until late in January when I loaded up a roll and found out it was feeding about 6"" of paper(plus the margin) before starting to print. I've tried the Panel Reset I found in another thread here but no joy. It's been in the shop twice since then for this. The first time the tech reset all the paper layout adjustments with the service software, I took it home and the problem was still there.
Back to the shop. I finally got a call today that it was ready and talked to another tech who said she set the margins to 3mm using the printer menu and it printed all right. Brought it home, set it up(with the 3mm margins) and it still feeds 6" of paper before starting the print.
I found a thread in the Wide format group that suggested setting the printer to sheet feed before loading the roll then changing to roll feed on the printer, I tried this but the printer switches itself to roll automatically then does it's trick.....
Driver settings:

I normally print from Lightroom but the printer does the same thing in CS3 and CaptureNX. No problems at all with margins on the sheet feed, either manual or from the tray.
Windows system, XP Pro SP2, latest drivers, firmware, updates etc.. Can provide more info if anyone needs.
Any help would be appreciated!
TIA,
Bill