Yes-- you're seeing the DOI translator. There is no dedicated translator for Cambridge books, so Zotero falls back on the DOI, for which it looks up data in the CrossRef database. And that doesn't provide abstracts or full text.
That Cambridge Online one works for me. It uses the DOI default translator, but I'm not seeing a problem. Is there error reproducible? Can you produce an error report?
It should start working again. If this works for you, please post here so that I can submit this change to be pushed to all users.
http://www.jstor.org.ezproxy.webfeat.lib.ed.ac.uk/action/doBasicSearch?Query=orwell&gw=jtx&acc=on&prq=orwell&Search=Search&hp=25&wc=on
Please go to http://github.com/ajlyon/zotero-bits/raw/master/JSTOR.js and save the file to the translators directory of your Zotero data directory (http://www.zotero.org/support/zotero_data).
It should start working again. If this works for you, please post here so that I can submit this change to be pushed to all users.
http://cco.cambridge.org/uid=11173/extract?result_number=9&search_scope=book&book_id=ccol0521495164_CCOL0521495164&query=modernism&id=ccol0521495164_CCOL0521495164A002