If you're tapping on the "My Purchases" button on the bottom left of your editing screen, we are aware of this issue and have a ticket in to our dev team to investigate.
You can still access your purchases by tapping on the small basket icon in the top right, or, you can use the search feature in the artwork gallery to access images by keyword. Search results will include free, purchased and available for purchase elements! Watch the below video for step by step instructions on both of these options!
We are sorry for the inconvenience and hope to have this fixed soon!