Empty box

We are testing Zotero for a while. A colleague cannot save online-articles from the electronical journal library (this journal: http://psycontent.metapress.com/content/1010-0652/). When she clicks on the symbol for saving the article, it appears only a empty box without the text "saving..". But when she enters the doi-number of the article into zotero, then it saves the article.

She has uninstalled zotero and Mozilla Firefox and installed both from the beginning, but nothing changed.

I can save articles from this journal. But she cannot...

Do you have a suggestion for solving this problem?

Thanks.
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