sheet size limits

[john]

Having issue with my plotter cutting sheets too short.
I use 22"x34" and 24"x36" page sizes (ANSI D, and ArchD)
the sheets are all cut at 33".  when printing from PC-Windows machine all works fine.  But with mac and Cups + Gutenprint v5.2.9 from my macbook pro late 2011 model with OS X 10.7.5 the sheets get cut at 33".
Is there a limitation with Cups or Gutenprint, can it be changed, fixed, altered?

Thanks
John