exit minimal

- Remove the calls to packages that are not essential to reproduce the problem (e.g., \RequirePackage, \usepakage)

- Remove the local definitions that are not essential. For instance, use
  \begin{figure}
  \includegraphics{filename}
  \caption{What ever.}
  \end{figure}

  instead of

  \def\fig#1#2{\begin{figure} \includegraphics{#1} \caption{#2} \end{figure}}
  \fig{filename}{What ever.}

- Use core classes when possible (e.g., article instead of scrbook).

- Cut to a minimum the content where possible (e.g., ‘Abc’ instead of ‘Blah blah ... for ever.’)

I work in a LaTeX environment different from where the bug reports typically originate. To understand the bugs I need to recreate the environments producing them. A sample file that isolates the problem reduces the debugging effort to a minimum.