I hope it's okay to post the problems in this thread.Not sure if the black box in the image is the ad in question but I nabbed a screenshot cause it was the only thing that looked out of place. Volume was too quiet so I didn't make out what the ad in question was, but it did play in that tab.
Region: South Dakota, United States
Where:The Nintendo E3 Press Conference Thread (System Wars)
I'm having the same issue, but it plays them loud and I sometimes get more than one playing at the same time.
My region is Michigan, USA.