Re: comandi variazione lingua in \section

Prova questo piccolo file
`
\documentclass{article}
\usepackage[greek,italian]{babel}
\DeclareRobustCommand\greco[1]{\foreignlanguage{greek}{#1}}
\begin{document}
\tableofcontents
\section{Blaterare}
Bla, bla, bla, bla, bla, bla, bla, bla, bla,
bla, bla, bla, bla, bla, bla, bla, bla, bla, bla.

\section{\greco{Alfa Beta Gamma}}
Bla, bla, bla, bla, bla, bla, bla, bla, bla,
bla, bla, bla, bla, bla, bla, bla, bla, bla, bla.

\end{document}
`

A me funziona benissimo.