OK, I've reduced my observed problems with index generation to a simple
test case:

\starttext
\placeindex

\page

\index{one}whatever  % Shows up [1]
\index{one+sub}whatever % Shows up correctly as sub-entry
\index{two}whatever   % Shows up [2]
\index{one}whatever  % Skipped because duplicate of [1]
\index{two}whatever  % Shows up as a duplicate of [2]
\index{three}whatever % Doesn't show up at all

\stoptext

So, both duplicate entries and missing entries. It could be that having a
mixture of 1-level and 2-level index entries isn't supported, but it *used*
to work... Unfortunately I hadn't updated my ConTeXt install in months, so
I can't tell when it broke.


mathew