I've tried to save both folders of citations and individual citations from a few open groups found at zotero.org/groups (in particular https://www.zotero.org/groups/739136/readings_on_open_source/items/ and https://www.zotero.org/groups/42126/z_guide_by_puckett/items) and get an error message. "An error occurred while saving this item. See Troubleshooting Translator Issues for more information." The only way I was able to make saving an individual citation work was to right click in the web page and select Zotero Connector > Save to Zotero > Save to Zotero (Web Page with Snapshot) even though the Zotero Connector icon in my toolbar appeared to be a journal article.

I attempted to troubleshoot and am usually the first to admit user error but I couldn't readily find a reason that this was happening (with the possible exception of an older operating system?).

I'm using Windows 7 (64-bit operating system), Firefox 56.0.1 (64-bit), and Zotero Standalone 5.0.23. I tried to recreate the problem using Chrome yesterday and the same error happened there, too. I submitted both a Standalone report and a Connector report several minutes ago.

Report ID: 1929556707 (Standalone)
Report ID: 1912203822 (Connector)