How to download Full text from Journal "Environmental Science and Technology" (ES&T)

I am a new user of Endnote X2. The full text download option is extremely helpful.

However, I can not download any article from journal ES&T, though our university IP has access to the full text document, which I can download through IE or Firefox.  This is only for ES&T and other journal works perfectly.

Does anyone have similar problem? 

Help please.