gerbmerge - uninterpretable line in DRD

As Olimex are no longer panelising without charge I am trying to use gerbmerge and have followed the tutorial here http://pauljmac.com/projects/index.php/Gerbmerge. However when I run gerbmerge it gives an error on the first line in the DRD file containing XY coordinates - Uninterpretable line. It does this with three separate projects.

The first few lines of one of the DRD file is:

%

T01

X 32850Y 48480 ← error on this line

X 32850Y 88480

X 57850Y 88480

I am using Eagle 6.1, with the CAM file and gerbmerge config from the tutorial

What am I doing wrong please?