Fixing internal storage issues
If this is not your first SuperSU version on 4.3, some files on your internal storage may have the wrong permissions, which will prevent you or your apps from deleting/modifying some files.
This can be fixed pretty easily, but you need to install busybox first, as toolbox's builtin chown command does not recursive directories. Once busybox is installed, this will fix the problem (run from terminal, adb shell, etc, as long as you have a su # prompt):
busybox chown -R 1023.1023 /data/media/*
