Prezis still available, not appearing in 'Your Prezis' view

Hello. I've just logged on to Prezi (free account) to find that all my Prezis are missing? I can access these directly by url (e.g. http://prezi.com/yt9rmarlrlra/strateg...) and in this view I can see my recent prezis; however the 'your prezis' view is empty. Is there any way to restore my Prezis to the 'your prezis' view?

Thanks in advance,
James