Metaeditor
Hi,
Please run a database integrity check, it should resolve your issue. You can find it in Acymailing->Configuration->Security under the Advanced section almost at the bottom of the page.
We did test AcyMailing v10 thoroughly, but we can't take into account countless 3rd party plugins and extensions that users can have installed on their sites
All the issues that user reported with version 10 actually turned out to be the issues with 3rd party extensions and plugins. 3rd party developers developed their integrations with AcyMailing using old API calls (which we deprecated since AcyMailing v6, but didn't remove from our code base until now).