I have observed that a \begin{enumerate} before the first appearance of an e.g. \section{...} environment causes problems. Why do I need to move \begin{enumerate} right before the first \item?
Overall, there is some sort of conflict between the first appearance of \begin{enumerate} and the first appearance of \section{...}. Is there a rule of thumb I missed about Latex or Latex2e?

\sectionshould never be inside anenumerateenvironment, if that is what you mean? Since a list environment should only be a list of\itemthen naturally\begin{enumerate}has to be before the first\item– David Carlisle Sep 11 '15 at 16:08\sectionis no environment – Sep 11 '15 at 17:49