Hi,

the following example causes

1) strange message: “invalid \starttext ... \stoptext structure” and

2) !LuaTeX error: PDF inclusion: file has changed 'Hga-typeset-buffer-001.pdf'
   ==> Fatal error occurred, no output PDF file produced!

\starttext
  \startbuffer [foo]
    foo
  \stopbuffer
  \typesetbuffer [foo]

  \startbuffer [foo]
    foo
  \stopbuffer
  \typesetbuffer [foo]
\stoptext

Marco