I upgraded to Thunderbird (78.4.0) over the past week – first on one Windows 10 computer – and noticed that messages open ... but they open ''behind'' the program. (To clarify: if I double-click on a message, I expect it to open on my screen, on top of everything else, so I can read it. Instead, when double-clicking now, the message flashes on screen quickly ... then disappears behind the Thunderbird program window. The message is there, but it isn't on top.) I figured that I did something wrong in my setup, but can't find where I screwed this up. Thunderbird still works great, but this is an issue for me – I like clicking on a message to read it, not having to tab over to the message. Thinking that I screwed something up, I upgraded Thunderbird on one of my other office computers and have the same results. I didn't any of my settings ... but I know I "broke" something somewhere. Thanks in advance for your help! DJ