reusing figures ok - problem with hiding blocks in MKIV

[Matthias Weber <matweber@indiana.edu>]

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Dear all,

after (finally) installing the minimals,
the  zip with the figures TeXs as expected  with MKII and MKIV.

Now, in MKIV I notice another issue. I use the \hideblocks mechanism  
to hide and reuse answers and get an error message (Undefined control  
sequence) in MKIV while everything is fine
in MKII.  I am attaching a sample file.

Thanks for all the help!

Matthias



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\setupbodyfont[12pt]


\setuppagenumbering[location={footer,middle},way=bytext]


\setuppapersize[letter][letter]

\setuphead		[section]
				[numberstyle=bold,
				page=yes,
				continue=no
]


\defineenumeration
[exercise]
[way=bysection,
text=Exercise,
start=1,
location=hanging,
letter=rm]

\defineenumeration
[solution]
[text=Solution,
way=bysection,
location=hanging,
letter=rm]

\defineblock[exercise,solution]
\hideblocks[solution]

\setupinteraction
[state=start]

\starttext

\section{Problems}


\startexercise 
Addition\index{addition} problem: $1+1=?$.
\stopexercise

\beginsolution
\solution
incorrect\index{incorrect} answer: 3.

\endsolution

\section{Answers to the Problems}

\reset[solution] 
\useblocks[solution] 

\section{Index}

\completeindex

\stoptext

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