Hans van der Meer wrote:

I am trying to follow the problems my typescripts create in mkiv. Using the \writestatus{}{} it turned out that its output to the console is delayed. And because the process seems to have entered an endless loop, I cannot zoom in on the error. The .log file turned out to be empty to.

Is there a better solution?

The likeliest cause of loops is still the tex macro expansion, so I would suggest \tracingall. If that doesn't help, try \ctxlua{print('') instead of \writestatus. Best wishes, Taco