Activity Stream widget shows posts that should not be visible to user

[c1rd]

Hello,

On our site we have several forums with disabled Users can see topics posted by other users? setting:

That way users without specific rules and guests should not see posts in those sections. That usually works, but especially with new posts, they sometimes see posts in the widget that they should not be able to see. Maybe it is some caching issue in IPB.

[Marc]

I would need specific examples and to know on what widgets these are being seen.