[@_ck_ Participant 16 years, 8 months ago]

Anything that used admin_email with bbPress 0.8.x has to be changed to from_email under 0.9 (I am not sure why it was necessary to break all the plugins like that but what is done is done).

It should take a simple edit. I still get notification emails under 0.9. I believe I posted the fix on the plugin page.