[AC Question]

face book image not saved the window appeared Screen Overlay Detected

[Kayza]

Do you have Twilight installed? If so, you need to disable it, save your image and then re-enable Twilight.

[B. Diddy]

Welcome to Android Central! There are many threads about the screen overlay issue on this forum. If Kayza's suggestion doesn't work for you, then try reading here: http://forums.androidcentral.com/sam...ly-select.html

[Crashlabs]

I had the same issue. This works for me:
When "Screen Overlay Detected" pops up the message contains "Open settings" option. Tapping it you find yourself in "Draw over other apps" menu. You can manually change the apps settings over by blocking "Permit drawing over other apps" function and get back. You can going through one other menu option. All these doings takes too much time especially if your Android contains dozens installed apps with "Drawing over other app" features. To know what to do you have to find out which app causes the problem to block precisely the right one.

How to fix "Screen overlay detected" on Android devices