[NTG-context] Too much space in fractions

Dear list, With \starttext $a/b$ and $1/2$ \stoptext I get too much space between a and /, and betwen / and b (and between 1 and /, and between / and 2). This was not so in earlier versions of ConTeXt (not sure when it first appeared). Is there some option I should change or is it a bug? Best regards, Mikael PS I attach the output I get, together with the similar LaTeX output (which looks like I (as a mathematician) am used to)