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<p dir="auto">A pdf produced via XeLaTeX from the following minimal tex file (using the lucida-otf support files from CTAN) displays fine in many pdf viewers but in Adobe Acrobat the plain = and its italic version show up faintly or in outline. I attach a screenshot of how it looks in Acrobat.</p>
<p dir="auto">This is a mystery to me. Does anybody have an idea of what might be happening?</p>
<p dir="auto">— Kai.</p>
<pre style="margin-left: 15px; margin-right: 15px; padding: 5px; background-color: #F7F7F7; border-radius: 5px 5px 5px 5px; overflow-x: auto; max-width: 90vw;"><code style="margin: 0; border-radius: 3px; background-color: #F7F7F7; padding: 0px;">\documentclass{minimal}
\usepackage{lucida-otf}
\begin{document}
\begin{tabular}{ll}
plain: & =\\
textbf: & \textbf{=}\\
textit: & \textit{=}\\
math: & $=$
\end{tabular}
\end{document}
</code></pre>
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