since I upgraded from 1.57 to 1.58, all images(thumbnails) in threads are visible for guests (not logged in users), although in the general usergroup setting, they do not have the right to see them.
It shoes the thumbnail view and if the gust is clicking on the image, the usual error appears that they do not have the right to see it and need to login.
I already disabled all addons in config.php to be sure that this is not a conflict with any addon. But still the same bug.
I did not change any settings. Before the upgrade, the thumbnails were not visible. After the upgarde, they are.
How can I fix this?