I have the TB icon on my task bar. A single click there no longer makes the program run. The task manager shows that an instance is listed, has 54.6M in memory, nothing else. I can actually begin the program by right clicking on the icon and then click on the icon in the right-click menu, but that only works if I stop the instance that shows on task manager With TB open, a click or double click on "Inbox" no longer opens the inbox. Now I have to right click and instruct it to open in a new tab, then go to that tab. I can double click on a message to open it, but a click or double click on "reply" does nothing now. It used to work. If I right click on the message in the inbox and click "reply to sender", nothing happens If I highlight a message and click "delete" nothing happens now. I used to be able to delete that way. If I highlight, right click and pick delete, it still doesn't work. I notice on the task manager that it shows 32-bit Thunderbird. I've used this for years, and on this laptop for 5+ years, but recently upgraded to w10. Hasn't worked since. Don't want to go back to Vista, v7, v8, v9. Help!