In my documents I use a macro in footnotes, which is defined though \dodoubleargument.
However, enabling interactions (which must be done too) plays havoc with \dodoubleargument, though \dosingleargument seems to escape unharmed.

Why is this? Can it be repaired?

Hans van der Meer

% Indexing in footnotes
\setuppapersize[A5][A5]
\setupinteraction[state=start] % [state=stop] => OK
\starttext
\type{ConTeXt  ver: 2011.11.17 23:31 MKIV}\blank
\def\testa{\dosingleargument\dotesta}
\def\dotesta[#1]#2{<#1><#2>}
OK: \type{\testa{abc}} \testa{abc}\par
OK: \type{\testa[def]{abc}} \testa[def]{abc}\par
OK: Now in footnote\footnote{testa{abc}}\par
OK: Now in footnote\footnote{\testa[def]{abc}}\par
\blank
\def\testb{\dodoubleargument\dotestb}
\def\dotestb[#1][#2]#3{<#1><#2><#3>}
OK: \type{\testb{abc}} \testb{abc}\par
OK: \type{\testb[def]{abc}} \testb[def]{abc}\par
OK: \type{\testb[ghi][def]{abc}} \testb[ghi][def]{abc}\par
OK: Now in footnote\footnote{testb{abc}}\par
ERROR: Now in footnote\footnote{\testb[def]{abc}}\par
errmessage: ! Argument of \string\dotestb\ has an extra \}.\par
OK: Now in footnote\footnote{\testb[ghi][def]{abc}}\par
\stoptext