I am getting mine started up an have spent most of my saturday with the same problem. action-modeler.com
<li id="menu-item-1016" class="menu-item menu-item-type-post_type_archive menu-item-object-forum menu-item-1016"><a>All Forums<span class="menu-tag">bbPress Forums</span></a></li>
Adding a second all forums menu doesn’t have the extra “bbPress Forums”.
Well I figured out setting it as a page to get the all forums. Apparently using the all forums from the “Forums” in menu manager is bugged.