I have read that Mingle forum does not support MU wordpress installations. Does this mean it won't work at the root of a MU site? E.g,, if my MU setup is http://www.mydomain.com with http://www.mydomain.com/site1, http://www.mydomain.com/site2, will the forum work at http://www.mydomain.com/forum or just not at all on a MU install?
Also, can you clarify whether the forum uses normal wordpress accounts or it's own? I want to use it with s2member to create wordpress memberships, who would also have access to the Mingle forums on the site.