ABP with root privileges prevents HTTPS

I have a rooted Android 4.4.2 and ABP 1.2.1. ABP works fine, until I grant it root privileges using SuperuserSU Free 2.40. After that (and after the phone reboot) all https connections stop working - including GooglePlay and https://www.google.com. When I prohibit root access for ABP and reboot again, HTTPS starts working again. Do I have something set up incorrectly, or can ABP no longer be used with root privileges?