I've installed ABP 1.3.1 for Opera in Opera 12.10 x86_64 for Debian Linux and added following subscriptions: EasyList+RuAdList, EasyPrivacy, RU AdList: Counters, RU AdList: BitBlock
Opera installed from official Debian repository.
1) It didn't block anything with all these subscriptions.
2) Removal of all subscriptions but EasyList+RuAdList did not helped at all.
3) After browser restart text-placeholders in the ABP preferences are shown instead of English text.
Tested on rutracker.org and epidemz.net - ads not blocked. On mediapapa.org adblock detection detects adblock presence. So, probably it partially works but I couldn't see where it works.