Still cleaning up the big device-ification mess from last version. Most all reported bugs are fixed now, so hopefully we are on the home stretch. Please grab the latest 0.129u5 update and verify that everything you care about is working fine and playing sounds as expected. And while you're at it, try out a few games you don't care about. Who knows, you might discover something new!
Once again, please report all issues over at MAMETesters to ensure they get proper attention. You will notice the large list of fixed bugs at the top of the whatsnew.txt. If it's not reported, don't assume we know about it!