[NTG-context] Problem with hidden text

28 May 2013

      Hello ConTeXist.
I have a problem with hidden text.When I compile minimal example (ala 
ConTeXtgarden example):

\starttext

Visible text: \input tufte

\startproperty[hidden]
  Hidden text:     \input tufte
\stopproperty

\stoptext

then I get errormessage:

(C:/context/tex/texmf-context/tex/context/sample/tufte.tex)
! Missing \endcsname inserted.

Problem is in last context standalone and context texlive 2012 too.

Thanx Jaroslav Hajtmar