Egon- I got the block when I tried to watch them today, too. Do you know the trick to free up additional views? It actually freed up my carousel and caused it to work properly, too.
1. Clicked on the "Watch videos" tab, displaying the carousel.
2. Clicked on the gray box below the courousel that says "Watch this video and get 5 view(s)!"
3. When it displays "There are no videos at this time" clicked on "Skip".
4. Clicked "OK" in the pop-up confirmation box.
5. That returned me to the carousel, fixing it so I could see the videos and get proper views for them.
That procedure also changes the box below the carousel to read "Watch these videos to earn more view(s)!", freeing up more videos if there are any there.
No guarantees it will work for everyone but it worked for me.
BTW, I use Google Chrome as my browser to view the videos.