I tried integrating bbPress (alpha 6) with 2.7 WP MU and ran into problems. The web-based installation failed if I selected integration (I left the “Add cookie integration settings” unchecked, only tried user database integration) – it threw up an error during the last step, and said Installation Halted! (although all previous tests and validations seemed to go through fine).
I dropped the bb_ tables, then installed bbPress without the integration options and it worked. Is it possible to modify a working bbpress installation to integrate with WP MU after installation? Has anyone done this before – and might have instructions online somewhere?