I don't know exactly when, but some time ago the fontawesome package started to misbehave: some symbols are not printed on the pdf. No error is issued but there is no symbol in the pdf.
\documentclass{article}
\usepackage{fontawesome}
\begin{document}
text \faInfo
\end{document}
Here the previous code produces a pdf with only "text" and no symbol. This only happens for some symbol.
How can I debug this?