In the latest beta (ConTeXt ver: 2014.11.04 19:10 MKIV), when I run

\definefallbackfamily[mainface][serif][IFAO Grec Unicode]

[range={02BB-F8FF,10140-1D513},

protrusion=quality,

expansion=quality,

mode=node,

kern=yes,

force=yes,

check=no,

rscale=0.95]

\setupbodyfont[mainface,10pt]

\definefont[Greek][IFAO-Grec at 10pt]

\starttext

ἔφεϲιϲ and τελειότηϲ

{\Greek ἔφεϲιϲ and τελειότηϲ}

\stoptext

the fallback Greek does not display. All I get is:

and

ἔφεϲιϲ and τελειότηϲ

This definition of \definefallbackfamily used to work. Has there been a change in the font mechanism?

Alan