It’s not a “just updated not that quickly” problem. It’s that’s it’s not updated at all. If a new topic is started in Boston board, say “Restaurants for Xmas dinner”, the RSS feed will only see one post, the original one asking for suggestions. Even if 10 people reply with good ideas, those 10 replies are never sent via RSS. Indeed someone using just an RSS reader, never even knows if someone replied unless they visit the web page. It makes the RSS feed IMHO useless.
Now that maybe what site owners want, but given that for the whole site there are two RSS feeds, “latest topics” (which behaves like the one feed for the Boston board) and “latest posts” (which behaves like what I’m asking for) it seems like such a feature would be good. I want “latest posts” for just Boston, not for everywhere in the country (which seems like it would be a huge volume).
My guess is it’s not a bug, but a configuration issue. Again the “latest posts” feed for the whole site works, it’s just too much volume, a “latest posts for a category” feed would be really useful.