Problems using ISBN to add item by identifier on Mac
I use Zotero on Windows and I have no problems adding books to my own Zotero library using the ISBN. However several people in my group are using Zotero for Mac, and Zotero fails to recognise most (but not all) of the same books that they try to add by ISBN.
We'd need a Debug ID from one of them for an attempt that fails to say more.
All functionality in Zotero that requires network requests to non-Zotero domains (e.g., attachment saving) will likely be broken for them until this is fixed.