So I've found the issues with your YouTube videos.
It appears that you are using
[tubepress playerLocation="popup" mode="user" userValue="ULearnDublin" theme="youtube" orderBy="published"]
as your current shortcode to load your YouTube video's.
As you can see, you have playerLocation="popup" in this shortcode. That should be set to playerLocation="shadowbox"
Another error in your shortcode is your orderBy="published" Published is not an accepted value for this option. I believe you actually want to be using "newest"
So, your shortcode should look like this:
[tubepress playerLocation="shadowbox" mode="user" userValue="ULearnDublin" theme="youtube" orderBy="newest"]
That should make everything work properly.
Please let us know if you have any more questions.
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