Strange, now they are there...
I'm really sure that they were not this morning.
Most times when I first access de site, the old-session is still 'active', so there are too many unread posts. When I press Ctrl+F5, the session is refreshed and everything is correct (that was also with the 'old' forum-version).
This morning I didn't see any yellow balls (also not after a forced refresh), and there were new posts.
But ok, never mind