For some reason I'm having issues installing apps from my sdcard. I saved some .apk files on my sdcard that I would like to reinstall. However, when I select the .apk file in Root Explorer (even the stock file manager) it goes to the window that has an "install" button and a "cancel" button. I try to press "install" but nothing happens. It doesn't highlight when I click it and it doesn't install. I CAN click "cancel" though, so I don't really understand why the "install" button doesn't work. Does anyone know what's going on here? Thanks!