In some circumstances Adv Area Audio or Adv Bar Audio may not function.

Steps:
Clean java cache
Launch Ensemble from the GA bundle
Using keyboard traverse the samples tree to Adv Area Audio Chart (it will probably load correctly)
Now continue with the traversal to Adv Bar Audio and it will not load.

Sometimes this can be produced with one working and not the other (see screen shots of the problem) or both not working or both have no problem. These steps work 100% of the time for me.