Hi 3tonine/Rachel – As a followup, make sure to have the latest version of the bbPress Enable TinyMCE Visual Tab plugin. I’m using WP 3.7.1, bbPress 2.5.1 with TinyMCE Advanced 3.5.9. I had to use bbPress Enable TinyMCE Visual Tab 1.0.1 in order for it work properly, and this doesn’t appear to be available yet from the WordPress Plugin Directory.
More info: https://wordpress.org/support/topic/not-working-in-bbpress-24
Regardless, thanks for the pointers to all the bits/bobs, once I got the correct versions it works great.