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On the Property panel of an Association element there is only one common Visibility property for both ends of the association. It is not correct, for each of the end of the association describes the behaviour of the two different attributes in two different classes. And their visibilities needn't be the same. The other problem, resulting from this is that the association has + or - on the side without an arrow or a dot. I.e. the visibility is set for the explicitely non-existent attribute.
This is not exactly true. The "visibility" field of the Association describes the visibility of the association itself; not of its member ends. Setting an Association to "private" doesn't change the visibility of any of its properties.