On Tue, Sep 26, 2017 at 1:19 PM, Henning Hraban Ramm
did you check you have
\setupinteraction[state=start] \setupinteractionscreen[option=bookmark] % should not be necessary \placebookmarks[chapter,section,subsection][chapter,section]
No trailing commas missing?
Not possible - both files use the same environment file where the above has been specified. If the problem was there, neither would work. However, the mystery deepens: I opened the not-working file in Acrobat Reader and it actually does have working bookmarks - of some reason SumatraPDF doesn't show them, but they are there. As most of my customers are likely to use Acrobat Reader, I'm not really worried about the bookmarks not showing up in other readers. Why SumatraPDF shows bookmarks in test environment, but not in the proper one is an enigma, but I'm no longer worried about it. Problem solved, at least close enough. Mari