Inb4 this is a codec issue, if it is. Then oh well, thought I should share either way as it bugged me out.
There is a issue with YouTube videos, in where if the video is less than 3 days old, YouTube will default show it using Flash. By default, Tower Unite will attempt to play it in HTML 5, but in the event that it cannot, it will go to Flash. I don’t believe that YouTube Streams are officially supported in Tower Unite however.