[texhax] Page dimensions differ when LaTeX run on different host

[Niall Mansfield]

I'm working on a book in LaTeX (thank goodness :-).
When I LaTeX the file here, the output is 470 pages long.
When someone at a different site does it, the output is 530 pages.

The 'layout' package shows the following dimensions (all in pt) differ:

				Mine	His
				----	---
	\oddsidemargin		-21	-11
	\textheight		538	462
	\topmargin		-39	-23
	\textwidth		402	352

The page dimensions are set with:

	\RequirePackage[papersize={177mm,232mm},twosideshift=0mm]{geometry}

How do you go about tracking down the cause of the differences?  The
only thing I can think of is to get a copy of all the .sty files used
(perhaps using the 'snapshot' package) and switching them in one by
one, but I dread the prospect.  Is there a better way?

   Thanks,
   Niall