At least I think it has. [Working on an unrooted Sprint Hero running 2.1.] I updated a number of apps the other day, and noticed yesterday that my 'menu' button has started operating like the 'home' button. Same activities - in an app, it returns me to home; long hold brings up recently used apps; and press on the home screen zooms all to all screens. My home button still works fine and the same. I use launcher pro, and recently updated that, but having the same problem when reverting back to Sense. Haven't dropped the phone or done anything I can think of that would have damaged the hardware. My thinking is that one of the apps I recently updated might be the culprit - but now have no way to get into the 'my downloaded apps' section of the market to try to see what I recently updated. But, suffice to say, it's a bit of a problem since I basically can't access the settings or menu of any app. Not sure what to do besides a factory reset, which would be pretty lame. Anyone have any ideas? Is there a way to reset buttons? Thanks!