Install from f-droid fails

#1

Sony Xperia Z3
Stock ROM - not rooted
Android 6.0.1
f-droid 0.102.3
Unknown sources enabled

With any app, f-droid appears to successfully download the package from the repo, but when I get the next screen notifying me of special access, only the cancel button works. The install button does nothing.

Do I need privileged extension installed? That appears to require root, yes?

Thanks ’

#2

Sounds like https://android.stackexchange.com/questions/69981/why-cant-i-press-the-install-button-when-installing-applications-from-unknown-s

#3

Solved! Screen filtering app iBlue, indeed. Thank you very much!

#4