Hi. I have a few problems with the newest version of thunderbird 115.3.0 (64bit), but I had the same problems with previous versions too. When I get an email, the name of folder(s) become blue and bold, an orange star appears and the number of unread emails increases. But when I click something (doesn't matter what) or slide a scroll, the name of the folder becomes black as it was on the beginning and the orange star disappears. When I click the name of the folder it again is marked with an orange star. Very often I don't receive email, but I should. I press "Get Messages" button, I see "no new messages" at the bottom of the window. I repeat it a few times and every time the result is the same. After 30 seconds or few minutes Thunderbird starts receiving messages from the last 2 hours. We noticed very similar behaviour on a several computers. I was tested also in safe-mode and everything looks the same.