I have the option checked to install non market apps, but if I download wifi tether, for instance, from the dev's website, my phone will not even let me click on "install," though I can hit "cancel." I've tried this with a free other apks, such a Swype, volume+, etc. Some allow me to hit install and some do not. Has anyone else experienced this? Any solutions? Btw, rooted gnex, stock 4.0.2, vzw.