Cambridge journals online - no automatic PDF
For example (proxy cut): http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=3920976&fulltextType=RA&fileId=S0140525X09000284
Zotero 1.5b2
Zotero 1.5b2
Works for me w/o a proxy; did you double-check that you have access to the PDF?
Might still be a proxy issue, I haven't looked at that page closely.
In principle, should automatic pdf download work when connected via a proxy? I would have thought so.