A document that runs fine under
   ConTeXt  ver: 2015.10.09 21:28 MKIV beta  fmt: 2015.10.11  int: english/english
suddenly doesn't under
  ConTeXt  ver: 2015.12.22 10:50 MKIV beta  fmt: 2015.12.27  int: english/english
mtx-context     | fatal error: no return code, message: luatex: execution interrupted

Loaded this beta today.
The previous beta runs ok, the new beta gives the error. The pdf produced in the latter seems at fault.
Anyone knows how this error can occur?