Hello,
Having read that this issue had been resolved, I confidently created a newsletter yesterday using my Firefox Developer and sent it to my client's 1,800 members. However, when I received it, I saw that the content was empty again!
When I displayed the newsletter to check its content, I saw that it had been deleted and that the editor configured in Joomla was displayed again, not the AcyMailing editor.
And when I checked the #_acym_mail_archive table, I saw that the newsletter was not there again.
For your information, the language selector displayed on acymailing.com does not work with Chrome but works with Firefox, so it is difficult to know which browser to use 😉