Hey folks,

My book was compiling fine with the Jan 27th nightly, but kicks the
bucket with the Feb 5th build:

! Undefined control sequence.
<argument> \strc_descriptions_yes_reference 
                                            
\secondoftwoarguments #1#2->#2
                              
\strc_descriptions_start_yes ...ons_yes_reference 
                                                  [#1]
l.12 \startdefinition[definition:Albedo]
                                        {Albedo}
? E
You want to edit file Source/Terms_and_Concepts/Terms_and_Concepts.tex
at line 12

The offending line is just: \startdefinition[definition:Albedo]{Albedo}

Hope that is helpful and my apologies if ConTeXt really is telling the
truth and my typesetting is just bad.

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