Help - my Web Pricing has disappeared

Hi

I have used Market Press eCommerce for 18 months for a volunteer organization that I work with.

3 days ago I went to update prices and add new products and the whole pricing set up has disappeared.
Has there been an update as my site shows I am running the latest version and it is up to date.
Has there been a change that has changed the settings as no one else has access to my site

Help please

Tim Apps