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I'm having the same problem as Peter Campbell. When I use the old URL (the one formed from the "Generate BibBase page from your Zotero 'Library', collections, or groups" link on the BibBase home page), the bibliography is updated when I make changes in Zotero, however only 100 items display: http://bibbase.org/show?bib=https%3A%2F%2Fapi.zotero.org%2Fgroups%2F2099979%2Fitems%3Fkey%3DPvXDODgx3ORkWmqcjLp3BAUk%26format%3Dbibtex%26limit%3D100&msg=embed.


When I use the new URL, all items display but no updates are reflected: http://bibbase.org/show?bib=http%3A%2F%2Fbibbase.org%2Fzotero-group%2Fajello/2099979&msg=embed.


You can see the difference in this report title (changed portion underlined): 

Old title: "Assessment of a Near-Term Update..." 

New title: "Assessment of a Near-term Update...".