Can't activate nor deactivate any administrator permissions outside of safe mode

Question

I just upgraded my Nexus 5 from 4.4.4 all the way to 6.0.1 and ran into a problem: I can't change any administrator settings outside of safe mode. I wanted to activate it for a screen lock app but the 'activate' button and 'cancel' button don't respond to touch, the same with any app in the list, whether to activate or deactivate. Screen orientation does not matter. In safe mode I can only see the apps already activated, none of which I now dare deactivate fearing I won't be able to reactivate them.



Can anybody help me with this?


— Assile | Sources

Answer

If you are using an app such as Facebook Messenger, CF.lumen, Lux or Twilight that draws over the screen, you'll need to stop them doing so in order to interact with secure settings pages such as the device administrator activation/deactivation pages.



For example, in Facebook Messenger, you would either close all chat heads or go to the Facebook Messenger settings and deselect 'Chat Heads', or in CF.lumen you would disable the overlay by pressing 'Disable' in the persistent notification.


— Ash | Sources

Q & A

Unpacking 'Non-Standard' Boot.img Problems for 64 Bit Device
Does "clear data" of a running app also "force stop"?
How to change time on Android 6 (Nexus 5x) with display off (adb?)
OnePlus 3: Unknown process 99041
Which Android phones support MiFare Classic NFC tags?
Nexus 9 upgrade to Nougat fails - how can I diagnose the problem?
Samsung build number and rooting SM-G900P
SMS only fetched when I turn the screen on
Apps report the phone's using mobile data even though it's connected to a WIFI
STAMINA / Ultra STAMINA mode on Marshmallow?
How to browse files on my PC from my Android phone via USB?
"Viper4android" removed "Audiofx" app permanently
Nexus 7 2013 USB connection failed
Phone behaves weirdly while charging
Marshmallow: Changing and connecting to an APN
Why this overloading issue in calling in CM13 and/or Android 6.0?
MIUI 8 extended icons
Why such outlined fonts appearing randomly in my phone?
How to root Samsung Galaxy A5 (SM-A500H) running Android 6.0.1
Change TMPDIR for Android shell script

Topics

2D Engines   3D Engines   9-Patch   Action Bars   Activities   ADB   Advertisements   Analytics   Animations   ANR   AOP   API   APK   APT   Architecture   Audio   Autocomplete   Background Processing   Backward Compatibility   Badges   Bar Codes   Benchmarking   Bitmaps   Bluetooth   Blur Effects   Bread Crumbs   BRMS   Browser Extensions   Build Systems   Bundles   Buttons   Caching   Camera   Canvas   Cards   Carousels   Changelog   Checkboxes   Cloud Storages   Color Analysis   Color Pickers   Colors   Comet/Push   Compass Sensors   Conferences   Content Providers   Continuous Integration   Crash Reports   Credit Cards   Credits   CSV   Curl/Flip   Data Binding   Data Generators   Data Structures   Database   Database Browsers   Date &   Debugging   Decompilers   Deep Links   Dependency Injections   Design   Design Patterns   Dex   Dialogs   Distributed Computing   Distribution Platforms   Download Managers   Drawables   Emoji   Emulators   EPUB   Equalizers &   Event Buses   Exception Handling   Face Recognition   Feedback &   File System   File/Directory   Fingerprint   Floating Action   Fonts   Forms   Fragments   FRP   FSM   Functional Programming   Gamepads   Games   Geocaching   Gestures   GIF   Glow Pad   Gradle Plugins   Graphics   Grid Views   Highlighting   HTML   HTTP Mocking   Icons   IDE   IDE Plugins   Image Croppers   Image Loaders   Image Pickers   Image Processing   Image Views   Instrumentation   Intents   Job Schedulers   JSON   Keyboard   Kotlin   Layouts   Library Demos   List View   List Views   Localization   Location   Lock Patterns   Logcat   Logging   Mails   Maps   Markdown   Mathematics   Maven Plugins   MBaaS   Media   Menus   Messaging   MIME   Mobile Web   Native Image   Navigation   NDK   Networking   NFC   NoSQL   Number Pickers   OAuth   Object Mocking   OCR Engines   OpenGL   ORM   Other Pickers   Parallax List   Parcelables   Particle Systems   Password Inputs   PDF   Permissions   Physics Engines   Platforms   Plugin Frameworks   Preferences   Progress Indicators   ProGuard   Properties   Protocol Buffer   Pull To   Purchases   Push/Pull   QR Codes   Quick Return   Radio Buttons   Range Bars   Ratings   Recycler Views   Resources   REST   Ripple Effects   RSS   Screenshots   Scripting   Scroll Views   SDK   Search Inputs   Security   Sensors   Services   Showcase Views   Signatures   Sliding Panels   Snackbars   SOAP   Social Networks   Spannable   Spinners   Splash Screens   SSH   Static Analysis   Status Bars   Styling   SVG   System   Tags   Task Managers   TDD &   Template Engines   Testing   Testing Tools   Text Formatting   Text Views   Text Watchers   Text-to   Toasts   Toolkits For   Tools   Tooltips   Trainings   TV   Twitter   Updaters   USB   User Stories   Utils   Validation   Video   View Adapters   View Pagers   Views   Watch Face   Wearable Data   Wearables   Weather   Web Tools   Web Views   WebRTC   WebSockets   Wheel Widgets   Wi-Fi   Widgets   Windows   Wizards   XML   XMPP   YAML   ZIP Codes