Just got my new nexus 7. I'm not sure if it's defective, but I tried adb and just simply dragging files onto it through usb. My windows machine acknowledges it and even shows Nexus ADB in device manager but I can't do these two things that my old nexus can do. Should I exchange it? Also, bottom of the Nexus 7 can be pressed down and it makes a clicking noise, because it seems like the screen isn't all the way flush. Very tiny problem... but it's brand new. My bigger cause of concern is the usb not working. Can anyone confirm?