My Nexus 9 tablet was recently updated to Android M (Marshmallow).
I can set up ABP on my local wifi connection and everything is OK for a while. Then my browser (Chrome), will complain that a site can't be loaded, or Flipboard will start to load a page but never complete. If I go to ABP settings and turn it off, or if I remove the proxy information from the wifi settings, everything immediately works again. If I then turn ABP back on, or add the proxy information to the wifi settings, nothing will load.
However, if I turn ABP off and wait for half a day or so, load a web page, and turn ABP on, everything will work ... for a while. Then once more Chrome or Flipboard will refuse to load, and I'll have to turn ABP off again.
There were never any problems under Android 5.x. Can anyone shed any light on what's going on here?