[NTG-context] prime accent not behaving properly

Hi, The "prime" accent (a') doesn't work properly in ConTeXt MKIV. I'm not sure when this became a problem, but it behaves differently in TL 2014 as it does in the latest ConTeXt. And it behaved differently on 9th November as is the version from 17th November. (In TL 2014 the two example below produce accents of different sizes.) Minimal example: \starttext \startformula s_i' s'_i s_i^2 s^2_i \stopformula \stoptext The first two symbols should look the same, but they don't. They should also be treated in the same way as "^2". With ConTeXt from 17th November the second example (s'_i) seems to behave OK (it was wrong in the version of 9th November), but the first example is still wrong. Should I switch back to MKII? ;) Mojca