On Sat, 1 Oct 2011, Pierre-François Bonnefoi wrote:

> Hello Luigi,
>
> your solution is better...but doesn't work completely : the first page is correct, the second is not, and after this one, the end of the document is correctly formatted...
>
> hum...
> Very strange and annoying...

Which version of ConTeXt you are using (see the log file)? I am using

ConTeXt  ver: 2011.09.18 22:35 MKII  fmt: 2011.9.18  int: english/english

and the following test file

\setuplayout[
   backspace=3cm, topspace=1.5cm,
   rightmargin=0cm,leftmargin=1.3cm,
   width=15cm,
   leftmargindistance=0.2cm,
   height=fit,
   header=0cm, footer=1cm,
]

\definelayout[1][topspace=5.2cm, height=fit]
\definelayout[2][]

\starttext
\showframe
\dorecurse{10}
{\input knuth
  \input ward
}
\stoptext

gives me the attached output.

Aditya