Francesco Menoncin wrote: > I hope this will be helpful. I think the main source of problem is in the > preamble.
The problem is that thm is only defined if you actually insert a Theorem in
your document. IMHO this is the right behaviour, and I wonder why it wasn't
the case before.
To fix your problem, you can exchange the preamble line
\renewcommand{\thethm}{\thechapter.\arabic{thm}}
by
\def\thethm{\thechapter.\arabic{thm}}
HTH,
Jürgen
