[NTG-context] Math blackboard (bug?)

To write blackboard math, the syntax was $\blackboard{N}$ , but now this also makes the rest of the text blackboard. So one has to use ${\blackboard N}$ . Is this indented? (the old way is a bit easier to use) Secondly, I want to address the blackboard font. Try out \starttext ${\blackboard NR}$ \stoptext This looks different then in the past. It doesn't have serifs. It looks like the wrong font, like sans. Is this a bug? To me it looks awful, honestly. It doesn't fit the rest of the math font at all. Best regards Johann