Problem on switching typefaces

Problem on switching typefaces

[Maurí­cio]

In the example below, all text printed on body font
is okay. However, the text inside braces disapears.
Problem seems not to be with specific typeface, as
'chorus' shows properly when used as body font. Also,
changing chorus for others (palatino, chermes, schola,
pagella etc.) do not solve the problem.

What do you think I'm doing wrong?

Thanks,
Maurício

%%%%%%%%%%%

\usetypescriptfile[type-gentium]
\usetypescript[gentium]
\usetypescript[chorus]
\setupbodyfont[gentium,22pt]

\starttext

Text on body font.

{
\switchtotypeface[chorus][rm]

Text on special typeface.

}

More body font text.

\stoptext

%%%%%%%%%%%

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