I rarely use the start menu, but I just noticed that several programs (i.e. MS Word, Excel, etc.; as well as some other non-Office programs) will not launch from the Start Menu. I have tried clicking on them, right click and "Open", and even moved them to the Quick Launch menu.(From the Quick Launch menu I can right click and "open" to launch, but not just click on them).
Some of them (on the Start Menu) still work (i.e. Windows Update, Firefox, IE9), but most do not work. I have unpinned them and re-pinned them and nothing changes; they still won't launch from the Start Menu.
Weird stuff . . . anyone got some idea of what's going on?