New Why won't any notification app work?

[kidstretch]

Why doesn't any notification app work in the current (and earlier versions?)
I remember some version ago i could use some apps like Light Flow or Knock2+ but now nothing, even if i enable them.

 

[kidstretch]

any info on this matter please?

 

[redmaner]

Go to settings >> applications >> application that doesn't work >> enable "I trust this app"
If this doesn't work then copy the app to /system/app folder with a root explorer

 

[kidstretch]

worked when i checked show popups, thanks!