On Tue, 2012-02-28 at 13:20 +0100, Hans Hagen wrote:
> apart from a funny corner at least it helps if the colors are defined
> 
> \definecolor[colour_page][red]
> \definecolor[colour_text][green]

Actually it doesn't. Even with the corner and colour variables removed,
or the latter defined, it makes no difference:

graphics        > invalid region for 'tbg:1'
! LuaTeX error /usr/share/texmf/tex/context/base/anch-pgr.lua:530:
attempt to index field 'list' (a nil value)
stack traceback:
	/usr/share/texmf/tex/context/base/anch-pgr.lua:530: in function
'fetchmultipar'
	/usr/share/texmf/tex/context/base/anch-pgr.lua:569: in function
'fetchmultipar'
	<main ctx instance>:1: in main chunk.
\ctxcommand ...\directlua \zerocount {commands.#1}
                                                  
<argument> ...tipars {\MPvar {self}}{\MPanchorid }
                                                   ; \includeMPgraphic
{\MPv...
\meta_process_graphic ...graphicformat ", \!!bs #1
                                                  ;\!!es , \!!bs
\meta_flush...
\anch_positions_meta_graphic_use ...#3\stopMPcode 
                                                  \endgroup 
\anch_positions_meta_graphic_nested ...graphic #2}
                                                  \endgroup 
\anch_positions_meta_graphic_direct_indeed ...ame 

\removelastspace }\smashbo...
...
l.36 ... and the methane/oxygen return propellant.

Using ConTeXt  ver: 2012.02.21 14:02 MKIV  fmt: 2012.2.28  int:
english/english.

-- 
Kip Warner -- Software Engineer
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http://www.thevertigo.com