I have a working installation of wp v3.5.1 + bbpress plugin v2.2.3 at http://www.robadadonne.it.
In dev-environment I enabled the MU subdomain feature and updated wp to 3.5.2 and bbpress to 2.3.2 nb: bbpress is enabled on all subdomains.
After this I have the following issue: http://mydomain.local/forums/users/51d19cefb9687 start to redirect to in a infinite loop http://mydomain.local/forums/users/51d19cefb9687/mydomain.local
The same page on a subdomain instead, for example http://kitchen.mydomain.local/forums/users/51d19cefb9687 works correctly.
nb: I suppose .htaccess is ok (on subdomain it works correctly)
Someone have the same issue?
Solved by following steps:
that's all!