About the Screen Filter app which I use pretty much all the time now.
Something people might not notice. This apps makes some buttons less responsive like Install and back buttons specially on Silk. Depending on the settings percentage it gets worse and sometimes you can't hit Install at all and it has to be disabled.
It also messes with Prime Streaming movies so it should be disabled before watching one. It also sometimes out of blue disables itself.
So if you find you are having button issues having to hit buttons twice and or it wont respond at all disable it and try again or set the percentage up higher and see if that helps.