bbPress problem

I've been trying for two weeks to figure out how to install bbpress-1.0-alpha-6 with my WordPress MU 2.7 and BuddyPress 1.0 RC-1. WordPress MU and BuddyPress have been working wonderfully for 4 weeks, but I can't even get BBpress to install, much less integrate it. No help on the bbpress forums, so I'm hoping someone might have a hint here.

During the bb-press install for cookie integration, none of the salt values appear in the WPMU 2.7 admin options menu that the instructions link to.

I get these errors at end of every bbpress install attempt:

>>> WordPress "auth" cookie salt not set.
>>>>>> Could not fetch "auth" cookie salt from the WordPress options table.
>>>>>> You will need to manually define the "auth" cookie salt in your database.
>>> WordPress "logged in" cookie salt not set.
>>>>>> Could not fetch "logged in" cookie salt from the WordPress options table.
>>>>>> You will need to manually define the "logged in" cookie salt in your database.
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Nevertheless, I get an email saying that the install was successful. But when I go to the BBPress admin in the WPMU dashboard it doesn't see the installation.