I’ve been working for the Indonesian translation up to 1.13 in the past. Been trying to update the ones at http://codex.buddypress.org/ but had no access, so these are where we put the localization in the future?
Got the same problem with one of the Buddypress installation in one domain.
Upgraded from RC-2 to 1.02.
But managed to get the other site with a different domain to work perfectly. Both had been upgraded following the perfect instructions on how to upgrade from RCs to 1.00 installations. Both WPMU 2.7.1 and from BP RC1 to BP 1.02.