On 2013-12-06 H. van der Meer wrote:

Some further experimentation: interchanging two chapters makes the
problem go away.

It is reproducible, because putting the chapters back als brings the
problem back. Even stranger, sitting at chapter 5 it kills the
interaction for chapter 6 and 8, leaving the interactivity for the
intervening and later chapters intact.

Addition of content to the start of chapter 5 helped for chapter 6 but
not for chapter 8, which seems strange.
Addition of content to the end of chapter 5 also helped for chapter 6

Addition of content to the start of chapter 7 did help to solve for
chapter 8.

So I fear it has in some way to do with the moment the output routine
is
called in relation to the reference processing in
\startchapter[title=,reference=].

This topic was discussed few weeks ago without clear conclusion:
http://www.ntg.nl/pipermail/ntg-context/2013/075988.html

In my case most of cases were resolved when I changed
\placebookmarks[chapter, section] just to \placebookmarks[chapter]
Although few cases still remain, it is much better now.

When the particular item doesn't react via bookmark, it doesn't react also
via ToC.

I plan to prepare an example for this, but for me it is not so urgent issue.

Jan

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