Hello,
Running KitKat 4.4.2 on an S5, and installed the latest ABP available as of today. I downloaded and activated easy list + Ru. Then I got an error in Hangouts that MMS could not be downloaded. I disabled ABP and tapped each MMS to try again and they can through.
This could mean that google is using some odd URL that is normally used in serving ads too, or maybe AT&T's MMS server was mistakenly added to one of the lists I had subscribed to.
Android ABP blocks MMS connections
Re: Android ABP blocks MMS connections
Please continue here: https://issues.adblockplus.org/ticket/195