The "last active" feature was disabled. As for "show topics started by this member," I'd forgotten that feature existed. And the interesting thing is that I just visited SMF's own site, and it isn't available there either. That most likely means one of two things: 1) the SMF devcelopers removed it at some point during one of the system's upgrades, or 2) it has never been a part of SMF and was instead part of YaBB SE (the forum's previous system and sort of SMF's parent system because SMF grew out of it) and when we moved from YaBB SE to SMF back in May 2004, we lost it. However, in either case, the feature is no longer available.