Using BuddyPress 1.2.6, and WP 3.0.1. I installed the BuddyPress Social theme 1.1.9 update, but did not include the Child Theme, because I assumed it would overwrite my customization in my Child Theme. The problem I'm having is that the members area is showing only two columns, and not the three I had before the update. The update gave the nice new Theme Options interface. The new Theme Options page properly shows 3-columns selected for both the homepage and blog layout. The malfunctioning member's area's two columns aren't side-by-side, but the left column goes down the page first, with the right column empty, then, below that, it switches to the right column filled, and the left column empty. When I reverted to 1.1.8, it fixed the problem, and went back to 3-columns in the member area.
What have I done wrong with this update?