I don't use any cache plugins except the wpforo cache.
If I made a configuration mistake I'm very happy to correct if you can find it. I'm actually using this widget because the feature where the users can use the "new" button doesn't work correctly.
Does it work when the filtering by forums is disabled?
In case you want to say thank you !) We'd really appreciate and be thankful if you leave a good review on plugin page. This is the best way to say thank you to this project and support team.