The "Badges" page states that the requirement for earning the "Talkative" badge is
Posted 10 messages, with 1 or more starred, in chat
It seems that I fulfilled this requirement about 48 hours ago -- at the moment, I'm at 26 messages, with 1 starred (the "Herbert Voß comparison" one). At first I suspected that the badge would be awarded only with some delay (e.g. like tag badges, which seem to be awarded on the following day), but in the meantime other users (Joseph Wright, Andrew Stacey) have earned the "Talkative" badge, apparently shortly after getting their first starred chat message.
Is this a glitch in the badge award mechanism or did I miss something regarding the requirement for "Talkative"?
EDIT: As I'm now a candidate for community moderator, I checked the candidate statistics site, and it also doesn't list my (duly awarded) "Sportsmanship" badge. This looks more and more like a bug in some database.
EDIT 2: Okay, scrap that "Sportsmanship" problem. But I'd still like to be "Talkative". :-)