Did you enable init.d?? I enabled that and faced the same problem....I think problem is supersu being in daemon mode (nut has warned something about the same in the OP) .... Fixed the same by going to Playstore and uninstalling then reinstalling supersu
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No ,i have not enabled init.d! I have tried to install SuperSu over Playstore, but it does not work! Also i can not unsinstall SuperSU !