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Our web host recently had a massive server outage and restored everything from back-ups. Since the back-up has been restored, I cannot send any campaign newsletters. My mac freezes with the spinning beachball when pressing the "send newsletter now" button, never advancing no matter how long it sits. The "test send this newsletter" button works perfectly. I am running PHP version 5.6 and tried 7.0 but that did not resolve this issue.
I suggest contacting your web hosting service provider to check if your MySQL database is corrupted or if it needs repair in view of the server outage.