If Group is Created before Forum Component Install, Group Cannot Post to Forum

[mercime]

I had just set up another test install with WPMU 2.9.1.1, BP 1.2-trunk-r2479 Monday. VHOST=NO, BP defined to blog ID 103 in wp-config.php

Right after I activated BP and bp-default theme, I created a new group, e.g. Membership. Then I installed Forums via one/two click. When I tried to post a topic in forum:

1. via Forums > New Topic, then choosing the group created before Forum component install, clicking on Post, redirects to home page where BP is installed ​http://samplesite.com/blogid103/ and there's no topic posted in forum. The strange thing was, the tags of topic-posted-but-not-seen were appearing in the sidebar. When you click on tag in sidebar, as expected, the topic not saved was not listed.

2. Group created before Forum component was installed does not even have a Forum link under avatar

in ​http://samplesite.com/blogid103/groups/createdb4foruminstall/

Per instruction of Andy ​http://testbp.org/groups/buddypress-1-2-bug-reports/forum/topic/bug-if-group-is-created-before-forum-component-install-group-cannot-post-to-forum/#post-1598, I went to that problematic group's admin > Group Settings but there's no "enable forum" link there at all.

[mercime]

I was finally able to get the "Enable Forum" option to appear in Group Settings by going through dashboard BuddyPress > Forum Setup > click on Link to Reinstall > Set Up New bbPress Installation and new bb-config.php was generated.

Previous forum posts by the non-problematic Group2 are still listed in Forum Directory Page and the formerly problematic group can now post topic in Forum.