[NTG-context] Error with anglebetween(…)

Hello Hans, has something changed with the anglebetween definition in MetaPost? I’m sure this worked a couple of betas ago. \startMPpage path p,q ; p := origin -- (50,0) ; q := origin -- (50,50); drawarrow anglebetween(p,q,"somelabel") ; \stopMPpage ! Missing `)' has been inserted. Regards Andreas