I normally do not use the Carousel..... but I did try it today to see if was working. Had NO problem at all with viewing the videos. This being said... I don't see where this is a WGT problem.
Perhaps...... there would be one or more reasons why the carousel would not be functioning for you;
The advertiser has blocked access from your particular geographical area or demographic due to low/no ROI?
The advertiser does not market products in your geographical area?
Live Gamer or the video sponsors have placed a number limit on the views any one participant can complete?
Who knows? But, as mentioned, I had no issues completing...