Since yesterday's update, when I start Thunderbird, it appears in the task bar, but not on the desktop. I can select it, or use Task Manager to "switch to" it, but right-clicking it does not give me a menu. (It used to be that it opened outside the visible desktop, but right-click gave me a "move" option and I could move it to the visible screen with the cursor keys). I know XP is on its way out, but...