Matej wrote:
Could you please some description of the solution here,
please, so that it could be found in archives?
Mike noted that, with babel+fancyhdr+natbib
the problem occurs in large documents with
\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\renewcommand{\sectionmark}[1]{\markright{#1}}
\fancyhead[CE]{\MakeUppercase\leftmark}
\fancyhead[CO]{\MakeUppercase\rightmark}
and seems to be due to the \MakeUppercase command. If you
move this to the marking commands like
\renewcommand{\chaptermark}[1]{\markboth{\MakeUppercase{#1}}{}}
\renewcommand{\sectionmark}[1]{\markright{\MakeUppercase{#1}}}
\fancyhead[CE]{\leftmark}
\fancyhead[CO]{\rightmark}
the problem does not occur. The reason remains opaque.
Ekkehart
