I have now fully uninstalled MiKTeX 2.7 and installed MiKTeX 2.8. Problem persists. Irritating.
It has something to do with the page layout not being interpreted correctly by pdftex, I think.
If I remove the a4paper option, I get two slides stacked on top of each other (the desired result), but the bottom slide cut off -- something wrong with both the size of the paper and the alignment of the slides on the paper.
To sum up, With
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\usepackage{pgfpages}
\pgfpagesuselayout{2 on 1}
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\usepackage{pgfpages}
\pgfpagesuselayout{2 on 1}[a4paper]
I tried to force a specific papersize by setting things like the following in the preamble:
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\def\pgfpageoptionheight{12in}
\def\pgfpageoptionheight{9in}
For reference, the pgfpages package defines the "2 on 1" layout as follows:
http://www.tex.ac.uk/tex-archive/graphi ... fpages.sty
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\pgfpagesdeclarelayout{2 on 1}
{
\edef\pgfpageoptionheight{\the\paperwidth} % landscaped by default
\edef\pgfpageoptionwidth{\the\paperheight}
\def\pgfpageoptionborder{0pt}
\def\pgfpageoptionfirstshipout{1}
}
{
\pgfpagesphysicalpageoptions
{%
logical pages=2,%
physical height=\pgfpageoptionheight,%
physical width=\pgfpageoptionwidth,%
current logical shipout=\pgfpageoptionfirstshipout%
}
\ifdim\paperheight>\paperwidth\relax
% put side-by-side
\pgfpageslogicalpageoptions{1}
{%
border shrink=\pgfpageoptionborder,%
resized width=.5\pgfphysicalwidth,%
resized height=\pgfphysicalheight,%
center=\pgfpoint{.25\pgfphysicalwidth}{.5\pgfphysicalheight}%
}%
\pgfpageslogicalpageoptions{2}
{%
border shrink=\pgfpageoptionborder,%
resized width=.5\pgfphysicalwidth,%
resized height=\pgfphysicalheight,%
center=\pgfpoint{.75\pgfphysicalwidth}{.5\pgfphysicalheight}%
}%
\else
% stack on top of one another
\pgfpageslogicalpageoptions{1}
{%
border shrink=\pgfpageoptionborder,%
resized width=\pgfphysicalwidth,%
resized height=.5\pgfphysicalheight,%
center=\pgfpoint{.5\pgfphysicalwidth}{.75\pgfphysicalheight}%
}%
\pgfpageslogicalpageoptions{2}
{%
border shrink=\pgfpageoptionborder,%
resized width=\pgfphysicalwidth,%
resized height=.5\pgfphysicalheight,%
center=\pgfpoint{.5\pgfphysicalwidth}{.25\pgfphysicalheight}%
}%
\fi
}
