[@touda Participant 11 years, 7 months ago]

I’ve tried workaround suggested by @mjpg but it’s had no effect at all!

I’ve edit role for one of the users, with general Author and bbPress Participant roles. Then activated:

read_private_forums
read_private_replies
read_private_topics

And it had no effect: topics inside private forums remained invisible for that user!

Than I tried and activated also, in the main roles section, the following:

read_private_pages
read_private_posts

And, still no effect!

🙁