The document class acm_proc_article-sp seems to be incompatible with the package titlesec. At least I can not load it. It fails with

! Undefined control sequence.
<argument> \subparagraph 

l.1470 \ttl@extract\subparagraph

However, the space below section titles is too little. The text attached directly. How can I automatically insert some space? (Instead of a manual \vspace)

  • Fixed a typo. -mod is an exact copy of the original. – ritter Apr 24 '13 at 20:12

If you're using the class for a submission, then you shouldn't modify its behavior: the editors of the journal or conference proceedings won't be happy.

In any case, the problem is similar to the one described in extra } when use titlesec package because the acm_proc_article-sp class doesn't define \subparagraph.

You should be able to get around the problem by adding a mock definition of \subparagraph by copying it from article.cls before loading titlesec:

  {3.25ex \@plus 1ex \@minus .2ex}
\let\subparagraph\relax % You don't want to use \subparagraph
  • Thank you! However you are probably right about not changing the behaviour. – ritter Apr 24 '13 at 20:23

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