Install from f-droid fails

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 ’

Sounds like

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