[@robin-w Moderator 6 years, 6 months ago]

yes, participants should be able to create topics and replies viz :

bbPress User Roles and Capabilities

I strongly suspect the issue is with active directory, you already have said that it rolls back settings, which makes me suspect that the entire WordPress database is being rolled back – if you create say a test post on the website, does it stay overnight, or does it disappear – this would help determine where to go next.