Appointments+ conflicts with bbPress 2.2 plugin

I tried installing bbPress 2.2 today because I’ve used it on another site and love it. But, the 3 custom post types didn’t show up in the navigation menu in the Admin panel at all (and entering the URL for them doesn’t work either). The bbPress “Forums” menu items do show up in Settings and Tools though. Strange.

I activated and deactivated all of my plugins and traced it to a conflict between WPMU Appointments+ and bbPress. As soon as I activate Appointments, the bbPress post types vanish. Does anyone have experience with fixing this? I really need to use bbPress.

WordPress version 3.4.2
bbPress version 2.2
WPMU Appointments+