Should this video be added?
Right, I hadn't watched it.
I now made an attempt to post the url and again it failed. So it seems you are allowed to do it and not me. Could it be a matter of user rights settings?
ETA: I have now watched the video, and I quite agree it is of little value except at an example of what a hit piece can look like. Seeing as the Vimeo video had in its title that it was the only LRH interview, I jumped at the discovery of another actual interview and figured maybe it might have been missed.
What exactly happens when you paste, or try to paste, a link on a page?
It simply returns me to edit mode until I remove the url.
Weird - I don't have an answer for that right now.
As a suggestion for debugging, create a test account and try and post a comment containing a url as a regular user.