If you are using the Workout Blender to accomplish this, I need to find out whether you are 1) working on a Mac or Windows, and 2) If Windows, are you using the newest version which was released within the last week? The older versions of the Blender are not compatible with our new videos and must be updated.
In our testing with the new version on Windows 7, we have not experienced any sync problems with the videos. If you can let me know the answers I can investigate further. Thanks!