HELP! After update: cannot change citations
                    HELP!! After installing the new Zotero version, I cannot change my citation in existing documents. I get the information "Word could not communicate with Zotero. Please ensure Zotero is running and try again. " and then a long link which I cannot copy. What should I do to get my citations in my documents back?                
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If you're only getting that for an existing document but it's working in new documents, see Troubleshooting Errors in Word Processor Documents.