After recent update of Asana-Math (packaged for MiKTeX on 2011-10-11) I noted that Greek letters and various arrows disappear from PDF file after it was saved from within Adobe Acrobat 10 (via the menu File | Save As | PDF...). I use such method of saving file to reduce its size. Asana-math font is loaded as follows:
\usepackage[math-style=ISO,bold-style=ISO]{unicode-math}
\setmathfont{Asana Math}
Note that the problem appears only if (1) my document is compiled with LuaLaTeX and only if (2) Asana-math font is loaded. XeLaTeX or STIX fonts work fine. I am sure that this problem did not exist before I updated Asana-Math a week ago (on 2011-10-28) since every week I compile new lecture for students and all previous lectures are OK.
Having opened PDF file in ordinary text editor, I see that the word asana
disappears after saving PDF file from Acrobat. It means that Acrobat removes Asana-math font from the file.
But why?
Update: I located a table in my book that caused the trouble. Here is minimal example extracted from that table:
\documentclass{article}
\usepackage{fontspec}
\defaultfontfeatures{Renderer=Basic,Ligatures={TeX}}
\setmainfont[Numbers={OldStyle}]{Minion Pro}
\usepackage[math-style=ISO,bold-style=ISO]{unicode-math}
\setmathfont{Asana Math} % damaged
%\setmathfont{STIXGeneral} % OK
%\setmathfont{Cambria Math} % OK
\begin{document}%
Fuel $T_{Br}$ $T_{\min}$ $\min(P_{Br}/P_{fus})$ \\
${D}{T}$ 2.7 39.4 $5{,}3\times 10^{-3}$ \\
${D}{D}$ 57.7 553 $4{,}1\times 10^{-1}$ \\
${D}[3]{He}$ 29.0 152 $1{,}4\times10^{-1}$ \\
${p}[11]{B}$ 295 2{,}6
\end{document}
Originally, compiled PDF file looks fine:
However some latin and greek letters, math symbols disapper after it was saved from within Adobe Acrobat:
This damage does not occur if source file was compiled with the aid of xelatex or if other math fonts is loaded. Here is how saved PDF looks when Cambria Math was used: