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Solved! Go to Solution.
Settings > apps > gear icon > Draw over other apps > look for the apps > tap > enable.
Take a look here:
/t5/Xperia-M5/Android-6-0-Marshmallow-screen-overlay-error/m-p/1148282#U1148282
@Mickyblue Do you have clean master installed? Can you check if the same occurs in safe mode?