[brad@foreverybody]

I was having the same problem. I back tracked through the code and found the problem was the admin section looking for a secure cookie and the login script was always setting the cookies without the secure flag. I worked around the issue by changing the force_ssl_admin function to always return true.

function is located in: bbpress/bb-includes/backpress/functions.core.php line 802-ish

hope this helps somebody.