When I access grommunio web with Firefox browser, I can only see mail body in preview, but not when I double click a mail.
Once I double cllick, the mail body blinks briefly and then vanishes.
However, when I press the reply button in such a mail, the body appears in that replay again.
Now the funny part; when I set said mail to unread and double click it again, all is fine, body is visible.
That problem does not happen with EDGE browser, but Firefox under Windows 10, Windows Server 2022, Ubuntu 24.04.
Any ideas?