I'm not sure if this is new in the 1.71 opt-in or whether I just haven't had the circumstances to create it before.
If you have a lot of weapons firing off in the battle viewer, in my case about a half-dozen disruptors from the same ship, then from what I can hear some of the weapon sounds are not played, so there's a little bit of a disconnect between what you can see happening and what you hear. Not a big deal, I know, but I thought I would throw it out there and see if anyone else has noticed it.