Thread:Project:Support desk/Thumbnails not shown for anonymous user (but only a part of them)

On my wiki I have some thumbnails that are not shown for anonymous user. When uou see here: http://encyklopedia.szczecin.pl/wiki/Szczecin_Niebuszewo there are no thumbnails that can be seen. But when you look at this: http://encyklopedia.szczecin.pl/wiki/Ludzie_z_wyspy anonymous user can see the thumbnails. Wht can causes the problem ? Files do exists. When you log in you will see all of the thumbnails...