I'm on a Samsung Note 5 and i have the same Screen Overlay issue - just a loop and nothing fixes it. Doesn't anyone know how to fix this? Nothing listed above has worked....I've tried everything applicable to me and my phone.
So... i finally found issue for my problem.
I tryed before EVERYTHING - check uncheck boot reboot and a lot of other things etc. NOTHING helped.
1.
So if u boot ur phone into safe mode(there is instructions how to do it) and u able to change sets-permissions for ur apps = so that means original android us not guilty in ur problems = so this is 3rd application which is holdind control of screen overlay.
2.
I was able change sets after rebooting but only about for 1min after rebooting then it was blocking again. So i figured out there is problematic-app which started slower then others.
!!And then i understood that it is ******* DataUsageMonitor app which displays how much cellular or wifi data is used. Uninstalled it and thats it!
3.
My suggestion is every user (with this problem) must think which app blocking his (her) screen. It can be file manager, light control, some widgets or etc.
If u cannot understand then try:
a.- start uninstall app one by one checking if sets option becomes available.
b.- or do phone reset and start over installing apps all the time checking if sets option is not blocked.
Good luck in finding this cheaky little app which is messing around in ur phone!
Regards,
Andre
Actually in my case i can stop DataUsageMonitor then change sets that i need then start again D.U.Monitor.
Because this app in my case takes control of screen overlay and i can uninstall it or stop it to make permission-changes in other apps.
Take care!