OpenX: Banner link target=_self is not working

It seems OpenX (2.8.7) doesn't take into a开发者_StackOverflow中文版ccount the attribute "target".

I tried using "_self" and "_top" but when clicking on the banner it always opens a new (_blank) window.

I found nothing interesting on their forum.

Is that a bug or am I doing something wrong?

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Setting target to '_top' should open in current window/tab.