On my computer, the music is working, but the video on Domenico's & Gioia's waltz was skipping except on one double reverse. On Amateur Standard 3, the music was working, but the video stalled. But you should probably get feedback from other sources before concluding there's anything wrong w/ your videos.
I also checked all of the videos and they are working.The problem could be that your connection is not fast enough.Sometimes when I want to view the videos and am staying in an hotel for instance then the video stalls.
It must be my connection - I can tell the videos are terrific, though it looks like I'll be going to the public library to see them at full speed. Thanks for posting them! It's great to be able to see Maurizio & Melinda w/out the camera switching to someone else.