I have updated to .314 (Brazil, OTA Vivo update) and I´m facing the same problem. I have tried to remove the previous permissions on SuperSU, but even allowing xposed installer again did no good.
Can anyone shows us what to do?
---------- Post added at 03:01 PM ---------- Previous post was at 02:49 PM ----------
I´ve found the solution
The problem is that after I have updated I lost root but that wasn´t clear to me. SuperSU still shows the dialog asking if something should get root and allowing something to get root would not return any error, but it wasn´t really rooted.
So, I´ve used the method below again (I used on my first root) and everything is fine now.
Hope it helps someone!