On Tue, 3 Jan 2012, Otared Kavian wrote:

> On 3 janv. 2012, at 08:38, Wolfgang Schuster wrote:
>
>> […]
>> You need a command after “align=middle” because you assign “middle ” (with a space) to the align key.
>
> I didn't get exactly what you mean, but saying either of the following:

I have not checked why the extra space is being introduced, but what 
Wolfgang meant was that

\setup<whatever>[key=value]

is the same as

\setup<whatever>
        [
          key=value,
        ]

but not the same as

\setup<whatever>
       [
         key=value
       ]

Whitespace is significant in ConTeXt setups. The last style is equivalent 
to

\setup<whatever>[key={value\n}]

and that could be the reason that you are seeing extra space.

Aditya