IMO there's a game breaking situation with AI getting themselves run out 6 times an innings during a test match. I have to quit and reload every time it happens just so I get a realistic game. This has been happening since they broke the fielding even more^^. I don't think there is any game breaking bug right now but some that we have to live with :
1. Annoying fielding bugs, don't think this this would be fixed any time soon.
2. AI batting against spinners is still awful specially in test.
3. AI bowling line in certain case not according to field and giving free opportunity to hit.