Thumbnail selection for uploaded videos not working anymore

I am no longer able to choose a thumbnail for my uploads. Before I could choose from 10 previews. Now I still have the 10 thumbnail previews, but clicking on a different one does not change the active thumbnail (even though the new selected thumbnail shows a green tick). I have tried this on several browsers and also my iPhone but it dosn't work anymore. Can this be fixed please?

Many thanks!

4 votes