I am using Tbird 128.4.3esr 64-bit in Windows 11. It's been running okay, but today I changed the viewing window to classic view/list view from card view. Each time I try to open a message (which is supposed to open in a new tab) by double-clicking, Tbird opens up a reply-to-message window instead, with a warning on it saying: "A unique identity matching the From address was not found. The message will be sent using the current From field and settings from identity <<user identity here>>." Thank you for any assistance. Hergrace