Hi all,
I've been struggling with basic page layout.

The left margin extends outside the left edge of the page.
Example (from the wiki):

\setuppapersize[A4][A4] % this is the default and may be omitted
\setuplayout[backspace=20mm,
    width=110mm,
    topspace=20mm,
    header=0mm,
    footer=0mm,
    height=250mm]
\starttext
\showlayout
\stoptext

Another example:

\setuppapersize[A5][A4]
\setuplayout[location=middle]
\usemodule[ipsum]
\starttext
\showframe
\ipsum
\stoptext

Thanks,
Jean-Guillaume