# LuaLaTeX + fontspec: cannot compare documents with Acrobat

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. So the issue is some interaction of LuaLaTeX and fontspec. Does anyone know what is going on and of a possible fix?

\documentclass{article}
\usepackage{fontspec}
\usepackage{lipsum}

\begin{document}

\lipsum

\end{document}


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Your document uses libertineotf which does a lot more than simply load fontspec. Try at first if the problem is also only with fontspec. –  Ulrike Fischer Jun 6 '12 at 10:35
@UlrikeFischer I did that of course, the result is identical (I just used libertineotf for simplicity of the MWE). Edit: little change in the MWE. –  Jörg Jun 6 '12 at 10:42
So it looks like a problem with the font loader and/or the binary. I don't have Adobe pro currently (this can change in the next days) so I can't make tests myself. I think it would be a good idea to post your problem to the luatex-user mailing list and perhaps also to the context mailing list (luaotfload is base on the font loader from context.) –  Ulrike Fischer Jun 6 '12 at 11:29
Try diffpdf instead. –  Martin Schröder Jun 6 '12 at 11:35
@NilsL Adobe changed the document comparison completely from v9 onwards. It works with all versions below 9 (but the new system is much improved). –  Jörg Mar 17 '13 at 17:55