Actually, Wolfgang, I suspect that \definefallbackfamily is working at all.
I get the same output even when I comment it out.

On Thu, Nov 6, 2014 at 7:51 AM, Alan Bowen <bowenalan03@gmail.com> wrote:

> Sorry, Wolfgang. I cut too much—
>
> \definefontfamily[mainface][serif][Antykwa-Poltawskiego]
> [protrusion=quality,
> expansion=quality,
> mode=node,
> smallcaps,
> force=yes]
> \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
>
> still fails. What I get is:
>         φει and τελειτη
>
>        ἔφεςις and τελειότης
>
> Note that the sigmas in the second line are now incorrect too.
>
> Alan
>
> On Thu, Nov 6, 2014 at 7:14 AM, Wolfgang Schuster <
> schuster.wolfgang@gmail.com> wrote:
>
>>
>> Am 05.11.2014 um 21:06 schrieb Alan Bowen <bowenalan03@gmail.com>:
>>
>> 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?
>>
>>
>> The fallback setting is only used when you have also a \definefontfamily
>> command in your setup.
>>
>> Wolfgang
>>
>>
>>
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>
>