I am playing the 3rd example of "Use of Blues Scale in Performance Context"
as I type.. Examples 1 and 2 loaded and played fine.
It sounds like your internet doesn't run fast enough.. I'm no computer guru so it's a total guess.
If you watch the down loading and play graphic at the base of your lesson screen you can see if the down load stops and the playing bar catches up with it..
Example 3 played completely as I double tasked typing this info..
Maybe some computer guru will chatch this post and shed some more light on the problem..
good luck and keep picking..