To me, the only real issue was how fielders didn't stop to catch the ball far too often. This happened in previous games but this year it happened much more often and it was too much. However, I don't think I've seen that happen in at least a few days so maybe it has been addressed.
Other than that, are there any real issues? Off the top of my head the only other real glitches are fielders not picking up the ball (which is rare in my experience) and that weird one where the runner keeps leading and your pitcher throws the ball away if he tries to throw a pick off. If I could tweak a few things, I would force the user to dive in the IF instead of letting the CPU do it, I would make it a little harder to change directions in the OF so taking a good route to the ball has more skill involved, and make the green throw accuracy from the OF much smaller because it is too easy to make accurate OF throws.
Overall, other than the glitches I mentioned (which if the fly ball lock on issue has truly been addressed, I can't complain much), I think fielding is actually far better than it was in previous years. To name a few things, the perfect throw feature has been great, OFs can no longer reach almost anything in the gaps (although I think this can be made a little more difficult as I mentioned above), and I have seen far fewer instances of infield hits that occur because the fielder took way too long to throw the ball.
Maybe I'm missing some things or the lock on issue hasn't really changed but I've just seen it less recently, but if it is indeed fixed or drastically reduced then I think fielding is actually pretty good overall.