HP Color Laserjet 9500n & SetNeutralAxis

I have an HP Color LaserJet 9500n which will print on 8 1/2 x 11 but not on 11 x 17.
When I try to print on 11 x 17, I get the following error code printed on 8 1/2 x 11 paper.
I'm using the latest PCL6 UPD from HP, on a machine running Windows 7 - 64 bit.

PCL XL error
Subsystem: KERNEL
Error: IllegalOperatorSequence
Operator: SetNeutralAxis
Position: 3

Does anyone know what this is all about, has anyone seen this before, or does anyone have a fix for this problem?

Thanks,

Lorne.