Today we changed some forums to no access toeveryone but the admins.

Now the Recent Topics widget shows nothing in the sidebar. Because all new topics were in those forums.

I have cleared all caches of wpForo, nothing changed. Apparently a bug, the widget doesn't take into account that the configured 5 topics to show, are from forums with no access.

Using filter by forum, solves the issue, still i think it is a bug.