(This is an issue I originally posted here:
http://tex.stackexchange.com/questions/58760/lualatex-fontspec-cannot-compare-documents-with-acrobat
and I cross-posted on the LuaTeX User Mailing list)
I use the option "compare documents" in Adobe Acrobat Pro a lot to highlight
changes between revisions. What I just noticed is, if I compile a simple
document such as the one below with LuaLaTeX + fontspec, Acrobat is unable to
perform the comparison, giving a unspecific error message ("cannot compare
document..."). Compiling the same document without fontspec allows the
comparison, as does XeLaTeX + fontspec.
I tried with TeX Live 2012 and the current MikTeX, without success. Ulrike
Fischer suggested \usepackage{luaotfload} \font\test=Arial \pagestyle{empty}
and \test after \begin{document} instead of fontspec, but the error remains.
Does anyone know what is going on and of a possible fix?
\documentclass{article}
\usepackage{fontspec}
\usepackage{lipsum}
\begin{document}
\lipsum
\end{document}
Best,
Jörg
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