Here's what I've tried:
- Click the little clockface to View it Later
- Go to my View It Later in YouTube. List is empty.
- I get a message: Your list is empty. Add videos to your list using this button: [+] but I don't see that button anywhere.
Looks like it's just a bug.
If I look at all my lists (in a row across the top of you YouTube account) it shows View Later as being empty. If I click on the view list hyperlick below it though,I get the list with the recently added videos.