I am currently faced with an unacceptable choice (ConTeXt  ver:  
2009.01.18 14:39 MKII).

My environment file has:

\enableregime[mac]
\mainlanguage[en]
% use \fr, \de, e.g., for local changes

%%%%	  Margin Kerning and Font Expansion
\usetypescript[serif,sans,mono,mm][hanging][normal]
\setupalign[hz,hanging]
\setupfootnotes[align={hz,hanging}]

\startfonthandling[greekpure]
\defineprotrudefactor . 0 1
\defineprotrudefactor , 0 1
\defineprotrudefactor ; 0 1
\defineprotrudefactor ? 0 1
\defineprotrudefactor - 0 1

\defineprotrudefactor hyphen 0 1
\defineprotrudefactor endash 0 .5
\defineprotrudefactor emdash 0 .33
\stopfonthandling

%%%%	  Default Encoding
\setupencoding[default=ec]

% install Latin Modern
% install margin kerning BEFORE the font is loaded: since Latin Modern  
is
% loaded before font definitions, load it again

\usetypescript[lmodern][\defaultencoding] 			%<<==
\starttypescript[serif][default][size]					%<<==
   \definebodyfont[9.5pt,10.5pt][rm][default]
   \definebodyfont[9.5pt,10.5pt][mm][default]
\stoptypescript									%<<==

\setupbodyfont[lmodern,rm,10.5pt]

%\setupfontsynonym[Serif][handling=normal]

% install Greek Font
\usemodule[ancientgreek] 
[font=GreekDioxipe,scale=1.15,altfont=GreekCanonica,altscale=0.9]

\setupfontsynonym[GreekDioxipe][handling=greekpure]
\setupfontsynonym[GreekCanonica][handling=greekpure]

If I run it as it is, the Greek fonts behave properly but I get  
arithmetic overflow errors as soon as ConTeXt reaches a footnote:
e.g.

! Arithmetic overflow.
\dododefineprotrudefactor ...width \fi \fi \relax
                                                   \rpcode  
\handledfont #1\di...

\dosetpairhandling ...ng \let \char \normalchar }}
                                                   \fi
<inserted text> ...ododefineprotrudefactor ! 0 .2
                                                   \dosetpairhandling  
\dodode...

\next1 ...csname \the \csname \@fha@ #1\endcsname
                                                   \fi
\rawprocesscommaitem ...commalevel \endcsname {#1}
                                                   \expandafter  
\rawprocessco...
<argument> punctuation,a
                         lpha,extended
...
l.34 \footnotetext[first]
                          {An Italian version of this review is to be  
publish...

If I comment the lines marked by %<<==, the Greek fonts do not print  
at the right size and I lose all control of the scaling. (Changing the  
scale accomlishes nothing.) Still, I do get footnotes and document  
processes properly otherwise.

Again, any suggestions would be greatly appreciated.

Alan