[@_ck_ Participant 17 years, 6 months ago]

Offhand I’d guess that the last poster function is meant to be “in the loop” for a per topic basis. Because you are trying to use it for an entire sub-forum, it’s missing a topic id reference. You’d have to calculate the last topic that the last poster posted in.

Posting the code to that part of the template would help (at least for me)