The later versions of Xibo haven’t done anything to change how the Layout duration works in playback - there is a good summary of this here: Understanding Media duration and how it affects playback. This also explains how looping works.
In your Layout the longest content by a long way is your RSS feed. You have the duration set to 5 seconds per item, and there were well over 40 items in the feed when I checked it.
This means your video will play through one time, wait on a black screen for ((5*40)-30 seconds) and then the Layout will expire and everything will start again.
As you only have 1 video, you should check the “Loop” checkbox in the Video region so that this content loops while the RSS is playing.