Thanks, Worfgang! I just tried this. I don't see any errors, but I don't see any PDF either. Here's the log file:
sorters > setting language 'en'
(layertest.tex
jobcontrol > resuming randomizer with 0.72399060029908
publications : loading formatting style from bxml-apa
(C:/context/tex/texmf-context/tex/context/base/bxml-apa.mkiv)
ConTeXt ver: 2010.07.30 11:35 MKIV fmt: 2010.11.9 int: english/english
system : cont-new loaded
(C:/context/tex/texmf-context/tex/context/base/cont-new.tex
systems : beware: some patches loaded from cont-new.tex
(C:/context/tex/texmf-context/tex/context/base/cont-new.mkiv))
system : cont-fil loaded
(C:/context/tex/texmf-context/tex/context/base/cont-fil.tex
loading : ConTeXt File Synonyms
)
system : cont-sys.rme loaded
(C:/context/tex/texmf-context/tex/context/user/cont-sys.rme (C:/context/tex/texmf-context/tex/context/base/type-def.mkiv) (C:/context/tex/texmf-context/tex/context/base/type-lua.mkiv) (C:/context/tex/texmf-context/tex/context/base/type-siz.mkiv) (C:/context/tex/texmf-context/tex/context/base/type-otf.mkiv))
system : layertest.top loaded
%
% begin of optionfile
%
% % runtime options files (command line driven)
% \unprotect
% % feedback and basic job control
% % handy for special styles
% \startluacode
% document = document or { }
% document.arguments={
% }
% document.files={
% "layertest.tex",
% }
% \stopluacode
% % process info
% \setupsystem[inputfile=layertest.tex]
% \setupsystem[\c!n=1,\c!m=1]
% % modes
% % options (not that important)
% \startsetups *runtime:options
% \setupoutput[pdftex]
% \stopsetups
% % styles and modules
% \startsetups *runtime:modules
% \stopsetups
% % done
% \protect \endinput
%
% end of optionfile
%
(layertest.top)
fonts : preloading latin modern fonts
{C:/context/tex/texmf/fonts/map/dvips/lm/lm-math.map}{C:/context/tex/texmf/fonts/map/dvips/lm/lm-rm.map}{C:/context/tex/texmf-context/fonts/map/pdftex/context/mkiv-base.map}
bodyfont : 12pt rm is loaded
language : language en is active
systems : begin file layertest.tex at line 12
systems : end file layertest.tex at line 24
system : cont-err loaded
(C:/context/tex/texmf-context/tex/context/base/cont-err.tex
systems : no file 'cont-sys.tex', using 'cont-sys.rme' instead
) )
mkiv lua stats : used config file - C:/context/tex/texmf/web2c/texmfcnf.lua
mkiv lua stats : used cache path - C:/context/tex/texmf-cache/luatex-cache/context/f53042fa2e1c106bc7e3383ec8c3a00c
mkiv lua stats : input load time - 0.026 seconds
mkiv lua stats : stored bytecode data - 231 modules, 54 tables, 285 chunks
mkiv lua stats : node list callback tasks - 6 unique task lists, 4 instances (re)created, 316 calls
mkiv lua stats : cleaned up reserved nodes - 33 nodes, 10 lists of 411
mkiv lua stats : node memory usage - 20 glue_spec
mkiv lua stats : used backend - pdf (backend for directly generating pdf output)
mkiv lua stats : loaded patterns - en::2
mkiv lua stats : callbacks - direct: 425, indirect: 4447, total: 4872
mkiv lua stats : result saved in file - layertest.pdf
mkiv lua stats : loaded fonts - 33 files: stmary10.afm lmmono12-regular.otf lmmono8-regular.otf lmmono9-regular.otf lmroman12-bold.otf lmroman12-regular.otf lmroman7-bold.otf lmroman7-regular.otf lmroman9-bold.otf lmroman9-regular.otf lmsans12-regular.otf lmsans8-regular.otf lmsans9-regular.otf eufb10.tfm eufb7.tfm eufm10.tfm eufm7.tfm msam10.tfm msam7.tfm msbm10.tfm msbm7.tfm lmex10.tfm lmmi12.tfm lmmi7.tfm lmmi9.tfm lmmib10.tfm lmmib7.tfm lmsy10.tfm lmsy7.tfm lmsy9.tfm rm-lmr12.tfm rm-lmr7.tfm rm-lmr9.tfm
mkiv lua stats : fonts load time - 0.262 seconds
mkiv lua stats : luatex banner - this is luatex, version beta-0.63.0-2010090921 (web2c 2010) (rev 3873)
mkiv lua stats : control sequences - 30982 of 165536
mkiv lua stats : current memory usage - 33 MB (ctx: 34 MB)
mkiv lua stats : runtime - 0.679 seconds