Mingle forums does work with Buddypress. It also allows for users to upload images into the forum.(Not just embed them) I have paired Buddypress and Mingle forums together. I am using Buddypress for image gallery capabilities, but I am about to swich totally to Mingle plugins, because I am very frustrated with Buddypress!
Not that I have found. I have spent over 3 days looking for a solution to Buddypress with BBpress. My problem with BBpress is that it does not have any reliable plugins to upload images to the forum. Mingle forums does this effortlessly. I would say that someone at Buddypress/Wordpress needs to address this because the forums are filled with unanswered posts and frustrated users. Go Mingle!