Screen Overlay detected solution

Screen Overlay detected on Samsung, OnePlus, HTC after Marshmallow update.

This message appears when you’re running a floating app, and then start a newly installed one, which requests access rights. Floating apps include the chat heads of Facebook Messenger that can appear floating above other apps.

Solution 1:

Force stop or delete your applications that running in background and effecting other apps like,

• Clean Master
• Screen brightness control
• App lock
• Drupe
• DU Batter saver
• Display temperature control 

And Samsung users has to turn off One Handed operation.

• Settings> Advanced features > One-handed operation.

Solution 2:

Step One:

Non-Samsung smartphone, follow these steps:

• Open the Settings
• Tap the magnifying glass at the top right
• Enter the search term “draw”
• Tap Draw over other apps
• Alternative route: Apps> [gear  icon]> Draw over other apps

For Samsung users:

• Open the Settings
• Then Applications > Application manager
• Press on More > Apps that can appear on top

Step Two:

You will find the list of apps that have permission. Turn all of them off.

  

Step Three:

Now you can try launching app again and it should work. 

Let me know in comment what did worked for you, or even if it didn't worked for you.