Hello, strange interaction between \boldmath and \textmu: %% To get upshaped \textmu: \usetypescript[modern][texnansi] \setupbodyfont[modern] %% Defining boldmath: \definetypeface[boldmath][mm][boldmath][modern] %% To get bold everywhere: \def\myBF{\boldmath\rm\bf} \starttext {\myBF bla $bla$ \textmu} % \textmu is slanted here Workaround: {{\myBF bla $bla$} \bf\textmu} \stoptext No a big problem, since there is a workaround, but strange for me... Cheers, Peter -- http://pmrb.free.fr/contact/