Hi, when a formula as with bold text context switches sometimes to the wrong alphabet, e.g. in this example \starttext {\bf 3 $3$} \stoptext context shows sometimes (you have to run the example a few times until it shows up) a sansserif bold 3 instead of a normal bold 3. The minimal example below shows this happens when the \mathfamilyattribute has the value 6, 7 or 8: \setupbodyfont[xits] \unprotected\def\font_helpers_synchronize_math_family{} \enabletrackers[math.families] \starttext 0: {\bf 3 $ \attribute\mathfamilyattribute\zerocount 3 $} 1: {\bf 3 $ \attribute\mathfamilyattribute\plusone 3 $} 2: {\bf 3 $ \attribute\mathfamilyattribute\plustwo 3 $} 3: {\bf 3 $ \attribute\mathfamilyattribute\plusthree 3 $} 4: {\bf 3 $ \attribute\mathfamilyattribute\plusfour 3 $} 5: {\bf 3 $ \attribute\mathfamilyattribute\plusfive 3 $} 6: {\bf 3 $ \attribute\mathfamilyattribute\plussix 3 $} 7: {\bf 3 $ \attribute\mathfamilyattribute\plusseven 3 $} 8: {\bf 3 $ \attribute\mathfamilyattribute\pluseight 3 $} \stoptext Wolfgang