Hi,
This seems to be a technical issue. The first thing to do, and everyone should always do it, it to keep AcyMailing updated to its latest version 🙂
To update AcyMailing to the v5.10.7, you can:
- download the package on your account page once logged in
- use the Joomla update tool if you have a Joomla website and attached it to a valid licence
If this doesn't fix the issue, you will have to contact the Acyba support on this page