Hi,

It doesn't work with the width=fit and width=middle options...

%\definelayout[mylayout][backspace=4cm,width=11cm]
%\definelayout[mylayout][backspace=4cm,width=9cm]

\definelayout[mylayout][backspace=5cm,cutspace=7cm,width=fit]
%\definelayout[mylayout][backspace=3cm,width=middle]

\setuplayout[mylayout]

\starttext
\doifdimensionelse{\namedlayoutparameter{mylayout}{width}}
{\ifdim\namedlayoutparameter{mylayout}{width}>10cm
  width > 10cm
\else
  width < 10cm
\fi}
{\processaction
   [\namedlayoutparameter{mylayout}{width}]
   [fit=>fit,
  middle=>middle,
  unknown=>unknown width]}
\stoptext

----------------------------------------------------------

width=fit

! Missing number, treated as zero.
<to be read again>
                   f
\@@lymylayoutwidth ->f
                      it
\doifdimensionelse ...mensionelse \scratchdimen #1
                                                  pt\relax
l.11 ...se{\namedlayoutparameter{mylayout}{width}}

----------------------------------------------------------

width=middle

! Missing number, treated as zero.
<to be read again>
                   m
\@@lymylayoutwidth ->m
                      iddle
\doifdimensionelse ...mensionelse \scratchdimen #1
                                                  pt\relax
l.11 ...se{\namedlayoutparameter{mylayout}{width}}

----------------------------------------------------------

Best,

Alan