Install button now won't
I've sideloaded a number of apps successfully, so I'm comfortable with the procedure. However, for unknown reasons I'm now being blocked. I tried too sideload the new Mantano reader and all went well until I went to tap the install button. It's non-functional! The cancel button works. I checked my settings to be sure I was still allowing apps from other providers. I tried installing other sideloaded apps. Every attempt the install button simply is non-responsive. Right up to that point everything seems normal. Any suggestions?