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From: ken@csis.dit.csiro.au (Ken Yap)
Newsgroups: comp.text.tex
Subject: Re: error in LaTeX's \paragraph command
Keywords: LaTeX bug
Message-ID: <1991Jan14.000029.3377@csis.dit.csiro.au>
Date: 14 Jan 91 00:00:29 GMT
References: <9562@mirsa.inria.fr>
Organization: CSIRO Division of Information Technology
Lines: 18

>When the "\paragraph" is followed by a word beginning with "plus" or "Plus",
>eg. 
>    \paragraph{title of the paragraph}
>    Plusieurs ...
>LaTeX will report the error as follows:
>! Missing number, treated as zero.
><to be read again>
>                   i
>l.35 Plusi
>          eurs ...
>
>
>I think it may be a bug in LaTeX.

Yes, it's a bug. Typically this happens when the last command in a
macro is one that will take an optional "plus" or "minus" followed by a
dimension.  The fix is for macro package writers to be careful to put
\relax after such commands.