Embedding Vimeo videos hides presentation?

We are in the process of swapping where our videos are house from YouTube to Vimeo.

When I try to embed using the embed code from Vimeo, and press 'Done', the screen freezes. The first time I did this, I then pressed 'Save and Return to Course' and now my whole module appears to be hidden:

Anyone know how I can unhide my module, or is it a case of starting again?

I've raised a ticket with Vimeo for the orginal issue.

Any insights would be appreciated!

Thanks