Hello out there...

>  > how should I use the \ShowFont command? (Module fnt-01)
>
> that one is used in the files that are generated by texfont and not
> useful outside that context.
Oh, I see. \showfonts already does exactly what I want :)

> strange, maybe due to the " being active? Are you in "german doublequote
> mode"?
Yes I am. And keeping the \mainlanguage in its original state solves this 
problem. Thanks. But One strange thing though:

% output=pdf
%\setupcolors[state=start]
\setupencoding[default=ec]
\starttext
\showfont[Serif at 12pt]
\stoptext

see the second line: colors are off as a default? But the above gives me 
blue numbers and a red box around the glyphs.

-- 
Viele Grüße, 

    Patrick Gundlach