Last night I posted here for the first time with my BuddyPress.org username. I can see the post if I am logged in, but not if I’m logged out. It think this is consistent with being assigned the bozo bit in bbPress.
Also, my profile said that the post in question was a reply, where I had clearly started the topic. It said I had started no topics.
On the BuddyPress side, my posts appear both when I am logged in and when I’m not, so I don’t seem to be a bozo on that side.
FWIW, I reposted a second time with one change (I removed a fake link I was using to illustrate my point) and now the post appears. So Ipstenu’s theory that this is an akismet problem appears to be correct.
UPDATE: I see the same issue on the BuddyPress.org forum.