1.1-beta3 fixes all notice errors.

Spent my sunday testing on each possible config : BuddyPress 1.6.4 with
group forums using bbPress 1.2, BuddyPress 1.6.4 with group forums
using bbPress 1.2 and sitewide forums under bbPress 2.2.4, bbPress
2.2.4 without BuddyPress, and finally BuddyPress 1.7 with bbPress 2.2.4
for groups and sitewide forums. I really think this new tag is the last
beta one before upgrading the plugin on WordPress official repo!