Testing with a current build now shows that the greek letters (M-x  
view-hello-file) are rendered using "STHeiti" Light.  Perhaps the  
"light" is the problem.  The accented alpha is still missing.

Adrian  - can you take a look at this?

http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=3174



         character: λ (955, #o1673, #x3bb)
preferred charset: greek-iso8859-7
		   (Right-Hand Part of ISO/IEC 8859/7 (Latin/Greek): ISO-IR-126)
        code point: 0x6B
            syntax: w 	which means: word
          category:
		   .:Base, G:2-byte Greek, c:Chinese, g:Greek, h:Korean, j:Japanese
       buffer code: #xCE #xBB
         file code: ESC #x2C #x46 #x6B
		   (encoded by coding system iso-2022-7bit-unix)
           display: by this font (glyph code)
     nil:-apple-STHeiti-medium-normal-normal-Light-12-*-*-*-*-*- 
iso10646-1 (#x1B8)

Character code properties: customize what to show
   name: GREEK SMALL LETTER LAMDA
   old-name: GREEK SMALL LETTER LAMBDA
   general-category: Ll (Letter, Lowercase)

There are text properties here:
   charset              greek-iso8859-7

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