exported postscript error

[Raphael Clifford]

I have produced a document in lyx 1.3.2 using various postscript images 
(some in eps).  When I export it as postscript I can view it in portrait 
but not in landscape (using gv).  Landscape gives me a postscript 
interpreter error.

Curiously it seems to view alright in pdf with acroread.  The postscript 
file is at http://www.dcs.kcl.ac.uk/teaching/units/cs1sen/cs1sen.ps.bz2 

Although that file is small it expands to over 2MB so be warned :)

Any help is very much appreciated.

Cheers,
Raphael
P.S. gv 3.5.8, gs 7.05 on redhat 7.3