misplaced systray menu
in linux, the systray context menu shows up exactly where the pointer is and might cover parts of the systray. most other apps show the menu below or over the panel, so nothing is covered.
in windows it's a lot stranger: the context menu is always shown in the top right corner of the screen. it's not the topmost part, but there is some place between the borders and the menu, but it's definately misplaced, as my taskbar is at the bottom of the screen ;) i asked a friend and it's the same for him.