> Do you use natbib, or some special bibliography stuff? No. And I have tried changing bib styles, makes no difference.
Also, I should mention, I actually get 5 errors. The one I quoted in my initial message is only the first. Then I get another error Missing number, treated as zero. ...s~\cite{Kosaka1998,Kosaka1999b,Baba2002b}. A number should have been here; I inserted `0'. (If you can't figure out why I needed to see a number, look up `weird error' in the index to The TeXbook.) and another Missing \endcsname inserted. ...s~\cite{Kosaka1998,Kosaka1999b,Baba2002b}. The control sequence marked <to be read again> should not appear between \csname and \endcsname. And a couple more like this last one. And for André, my bib file contains no underscores at all. Oh, and I am using lyx 1.3.3. Alex.