Math formula deleted: Insufficient symbol fonts

[Bill McClain <wmcclain@salamander.com>]

Here is a strange case. Using ConTeXt 2002.7.26, pdfeTeX, Version
3.14159-1.00a-pretest-20010806-2.1.

I have a script which uses Adobe Sabon, but I switch back to CM and use
math mode when I need just a few Greek characters. All was working well
until I started adjusting font size, and then I got:

    ! Math formula deleted: Insufficient symbol fonts.

upon encountering the first math mode usage. Some font sizes work and
some don't:

ok: 10, 10.0, 10.01, 11
no good: 10.1, 10.2, 10.3, 10.4, 10.5

Looks like a fractional font size problem, although I can't explain why
10.01 works, unless it is rounded to a whole point size.

Here is a small script demonstrating the error:

* * *

\usetypescriptfile[type-sabon]
\usetypescript[Sabon]

\usetypescript[modern][default]

\setupbodyfont[Sabon]

\def\Greek#1{{\switchtobodyfont[modern]$#1$}}

\starttext 
% ok
\switchtobodyfont[11pt]
Here is an alpha: \Greek{\alpha}.

% ok
\switchtobodyfont[10pt]
Here is a beta: \Greek{\beta}.

% ok
\switchtobodyfont[10.01pt]
Here is a gamma: \Greek{\gamma}.

% no good!
\switchtobodyfont[10.5pt]
Here is a delta: \Greek{\delta}.
\stoptext

* * *

-Bill
-- 
Sattre Press                                      Tales of War
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