I forgot to mention I am using WordPress 3.3.1 and the plugin bbpress 2.0.
I am having the same problem, on the same platform. Not much support for this issue, re uploading theme and plugin now
Disable any bbpress related, not the actual, plugins. I had several and problem resolved by disabling plugins. Possibly bbPress2 BBCode, bbPress Threaded Replies, or bbPress Topics for Posts.