By the way, I've had those top menus that open to left happen when windows installs a touch/ink/stylus input device. There's a control panel setting somewhere for input devices like these, where there's a checkbox (that sometimes magically self-re-enables) for making menus appear to left for the purpose of accomodating on-screen hand-writing for right-handed writers. It's a bit weird that it ends up affecting the menus even when you stricly use a mouse to open them.