Bear with me, I have not thought this through all that well yet.
Looking at Iowa's posts, and mine... then SpeedKills, and ZN's, there is a difference. I think the real culprit here, (even though this board DOES work if video links are added a certain way), is our somewhat old software.
When you go to YouTube the 'share' functions you see BELOW the video can work, but it's temperamental. Harder to get right. What does seem to work every time... for me, IS:
Do not use the 'share' link.... go to the actual URL address bar and copy THAT link. Then proceed on this website with the YOUTUBE tool, pasting the link, and then removing the "S" from the HTTP.
This does NOT address what sstRams is experiencing WHICH, if I understand correctly, is that he can't see ANYONE'S videos. I did, however, edit one of his videos that still included the "S" and it showed up for me.