[NTG-context] \setupdelimitedtext not working in TeXLive 2012

2 Sep 2012

      This used to work to provide proper behavior for nested quotations. Now, 
it doesn't work and the log shows errors for all 3 of

"missing or ungrouped '=' after 'n' (371>quotation:)"    where n=1,2,3 
as they are encountered.

\setupdelimitedtext
   [quotation]
   [1]
   [left={\symbol[leftquotation]},
    right={\symbol[rightquotation]}]

\setupdelimitedtext
   [quotation]
   [2]
   [left={\symbol[leftquote]},
    right={\symbol[rightquote]}]

\setupdelimitedtext
   [quotation]
   [3]
   [left={\symbol[leftquotation]},
    right={\symbol[rightquotation]}]

Did the syntax change or is it a bug?

-- 
Bill Meahan
Westland, Michigan USA