Is it just the Salsa, or have you tried videos of other dances, too?
If you're having trouble viewing all videos on the website, we'll have to troubleshoot your configuration to make sure that your computer or device supports the necessary components (Flash, Quicktime, HTML5, etc).
If it's only Salsa that's giving you trouble, that would be a much more curious issue, since the Salsa videos are no different than any of the others. If that's the case, we'll have to look into it further. I just checked a dozen or so of the Salsa videos, and they seem to be playing just fine for me. It could be something as simple as a temporary problem with all videos at the exact moment you were checking the Salsa videos, in which case I would recommend simply trying again now to see if the problem persists.
At any rate, give that a try, then let us know more details, and we'll do our best to help you out.
Regards,
Jonathan Atkinson
BallroomDancers.com