by Jason Caldwell » August 4th, 2010, 11:30 pm
Hi there... Thanks for reporting this.
s2Member's MailChimp integration IS designed to support the FNAME, LNAME, OPTINIP fields for MailChimp. However, it appears that you have BuddyPress installed, which throws a monkey wrench into the way s2Member pulls that information. BuddyPress receives the full name, instead of the two different fields.
~ I'll add this to our list of things to go over before the next release.
@C/TODO :: check register-access.inc.php for possible fixes to BuddyPress/MailChimp integration.