If I have Thunderbird up, then I put windows in to Sleep mode, when I come back again, the Start menu in Windows 10 automatically pops up (can anyone tell me how to stop this?). If I click anywhere on the screen the start menu disappears and everything works fine, but if I forget to do that and for example, double click on an email to open it, Thunderbird then freezes. If I close down Thunderbird and reopen it, it then it brings up the email that I had clicked on, so it must have been trying to open it whilst it was frozen. This isn't a big problem, just blooming annoying. Don't know if this is a Windows 10 problem or a Thunderbird problem. If someone can tell me how to stop the Start menu from popping up automatically, it wouldn't fix the problem, but it would at least go away!