when increasing or decreasing a heading the heading changes to
unnumbered (with the properly increased or decreased level). the
problem occurs only in the book (tufte) document class, not in article
what is wrong?
where is the code which defines this? my lyx layout file for tufte has
the date 2009/11/15.
i have just upgraded to lyx 2.0.4 - on linux (xfce ubuntu)