Hey list,

The last few nightlies, including the most recent one I have installed,
2013.03.21, keeps bailing when attempting to typeset one of my documents
with the same error:

        ! Undefined control sequence.
        <argument> \????sf 
                           :\v!style :\v!serif 
        \setvalue #1->\expandafter \def \csname #1
                                                  \endcsname 
        l.256 \setvalue{\????sf:\v!style :\v!serif      }
                                                         {rm}
        E
        ? You want to edit
        file /usr/share/texmf/tex/context/third/simplefonts/t-simplefonts.mkvi at line 256
        
        mkiv lua stats  > used config
        file: /usr/share/texmf/web2c/texmfcnf.lua
        ! LuaTeX error <local type = type...>:21: attempt to concatenate
        a table value.
        <argument> \????sf 
                           :\v!style :\v!serif 
        \setvalue #1->\expandafter \def \csname #1
                                                  \endcsname 
        l.256 \setvalue{\????sf:\v!style :\v!serif      }
                                                         {rm}

The line it is referring to contains the following:

        \setvalue{\????sf:\v!style :\v!serif      }{rm}

I hope that is helpful.

PS Please cc me, as my subscription is not currently active.

-- 
Kip Warner -- Software Engineer
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http://www.thevertigo.com