Hi, Brigette.
We did restructure how lessons are formatted about 6 months ago. We used to have separate pages for the performance, basic and advanced melody videos. The new format includes all videos in a single page. You can now move from performance, basic tutorial, and advanced tutorial from the same location now. Hopefully it makes sense as you poke around a little.
As far as the rest of the website design, everything else has remained the same, so perhaps the change to Windows 10 may have created the difference for you. Just let us know if you can’t find something and we’ll get you pointed in the right direction.
C