The Alt key activates the menu. This new behaviour in CS5 is driving me nuts. When you try to zoom with the mouse wheel and Alt if you don't press ESC or Alt again you are confronted with annoying beeping. And let's say use a shortcut like Ctrl+Alt is fine but if you press it the other way Alt+Ctrl again activates the menu. This was not the case in previous version of PS, it woulb be nice if this is fixed.