i found out what was the problem for me, this could be a bbpress bug. In wp_options in database i found a column named wp(tableprefix)_user_roles, in the array there was missing two roles bbp_participant and bbp_moderator.
add this. and don’t forget to tell the big array that there’s one more array in the array.
s:15:”bbp_participant”;a:2:{s:4:”name”;s:11:”Participant”;s:12:”capabilities”;a:28:{s:8:”spectate”;b:1;s:11:”participate”;b:1;s:8:”moderate”;b:0;s:8:”throttle”;b:0;s:10:”view_trash”;b:0;s:14:”publish_forums”;b:0;s:11:”edit_forums”;b:0;s:18:”edit_others_forums”;b:0;s:13:”delete_forums”;b:0;s:20:”delete_others_forums”;b:0;s:19:”read_private_forums”;b:1;s:18:”read_hidden_forums”;b:0;s:14:”publish_topics”;b:1;s:11:”edit_topics”;b:1;s:18:”edit_others_topics”;b:0;s:13:”delete_topics”;b:0;s:20:”delete_others_topics”;b:0;s:19:”read_private_topics”;b:0;s:15:”publish_replies”;b:1;s:12:”edit_replies”;b:1;s:19:”edit_others_replies”;b:0;s:14:”delete_replies”;b:0;s:21:”delete_others_replies”;b:0;s:20:”read_private_replies”;b:0;s:17:”manage_topic_tags”;b:0;s:15:”edit_topic_tags”;b:0;s:17:”delete_topic_tags”;b:0;s:17:”assign_topic_tags”;b:1;}}}
