Re: Fatal Errors after 1.1.2 install
Just a random thought. Before upgrading, or at least activating, the new version of BuddyPress, did you run the upgrade script for WPMU? Under the Site Admin menu, there is a sub-menu item called Upgrade. If not, deactivate BP, then try hitting that button. After it is finished, reactivate BP.
I’m just working through a mental list.