CADScript 8.9 - printing only to 8.5x11

We are using CADScript 8.9.4.9 and MicroStation 8.9.4.51.

When my client plots a DGN that he created using MicroStation/J or MicroStation 8.5.1.25 on his HP1055CM, it is always plotting to a small paper size (8.5 x 11) - even though he is selecting a large paper size.

 His papersizes are correct in his Paper.dat file.

 Has anyone else had a similar problem - or have any ideas why this could be happening?

As a short-term solution we have downgraded this client back to MicroStation 8.5.1.25 and the old Corporate Montage CADScript so that he can plot his old DGN files.

Thanks,
Anna