I wanted to chime in. I have the exact same problem with my Nexus Player. Just like jehuty224, I can't sideload.
EDIT: I just tried uninstalling, wiping cache, and then installing the 1.1.1 apk. I think I'm back in business.
EDIT: I just tried uninstalling, wiping cache, and then installing the 1.1.1 apk. I think I'm back in business.

