[NTG-context] nasty crash

A nasty crash occurs with no helpful output in the log. It seems likely to arise from a complicated hbox, because the log ends abruptly in: \hbox(80.33+74.07002)x426.78 The output on the console isn't helpful either, I merely get: pages > flushing realpage 12, userpage 8 mtx-context | fatal error: no return code, message: luatex: execution interrupted This log message isn't closed with a newline. Of course I tried to construct a minimal example, but did not succeed. When I isolate the page where the execution crashes then no error occurs. It might be something in ConTeXt, but also something in luatex. Any idea how I can collect more information for trying to pinpoint the problem? Hans van der Meer