[NTG-context] lm bug?

hi here is a image of 4 pdf file. a.pdf is compiled using lm fonts under mkii b.pdf is compiled using lm fonts under mkiv c.pdf is compiled using cm fonts under mkii d.pdf is compiled using cm fonts under etex+dvipdfmx So I think there is some problem with lm otf fonts (or maybe mkiv do not embed the hinting correctly? Yue Wang