bbPress compatibility

Hello, bbPress print inline JavaScript requiring tinymce, jquery.ui, quicktags and more…
It test if tinymce is undefined (this is why you don’t get any error). I don’t know why buddyPress did this inline (and not in an external file…) :

<script>tinyMCEPreInit = {
			baseURL: "",
			suffix: "",
						mceInit: {},
			qtInit: {'bbp_reply_content':{id:"bbp_reply_content",buttons:"strong,em,link,block,del,img,ul,ol,li,code,close"}},
			ref: {plugins:"",theme:"modern",language:""},
			load_ext: function(url,lang){var sl=tinymce.ScriptLoader;sl.markDone(url+'/langs/'+lang+'.js');sl.markDone(url+'/langs/'+lang+'_dlg.js');}
		};</script>
<script>
var ajaxurl = "/wp-admin/admin-ajax.php";
		( function() {
			var init, id, $wrap;

			if ( typeof tinymce !== 'undefined' ) {
				// Fix RTL
				tinymce.on( 'addeditor', function( event ) {
					event.editor.rtl = event.editor.settings.rtl_ui ||
						( event.editor.editorManager &&
						event.editor.editorManager.i18n &&
						event.editor.editorManager.i18n.rtl );
				}, true );

				for ( id in tinyMCEPreInit.mceInit ) {
					init = tinyMCEPreInit.mceInit[id];
					$wrap = tinymce.$( '#wp-' + id + '-wrap' );

					if ( ( $wrap.hasClass( 'tmce-active' ) || ! tinyMCEPreInit.qtInit.hasOwnProperty( id ) ) && ! init.wp_skip_init ) {
						tinymce.init( init );

						if ( ! window.wpActiveEditor ) {
							window.wpActiveEditor = id;
						}
					}
				}
			}

			if ( typeof quicktags !== 'undefined' ) {
				for ( id in tinyMCEPreInit.qtInit ) {
					quicktags( tinyMCEPreInit.qtInit[id] );

					if ( ! window.wpActiveEditor ) {
						window.wpActiveEditor = id;
					}
				}
			}
		}());</script>

So, WP Deferred JavaScript is not natively compatible with this plugin. You can try to exclude tinymce from the defer process (using the plugin setting panel).