We have a large number of reports of issues inserting and editing draw.io diagrams in Confluence Cloud. Please follow this thread for status updates.
Atlassian have posted a status update on http://status.atlassian.com/. You can subscribe by email or SMS to incident updates on the page.Their latest release broke all Confluence Connect macro add-ons (that's draw.io, PlantUML and Google Drive Connector for us).
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