Apply the update, if you have not already. Elonex advised that the update should help resolve the issue. However, to get them to work properly, I then had to remove the ebooks I bought from the ereader and then copy them across again to put them into the new folder that the update created. If it then still fails press Waterstones for a refund on the book that does not work, they suddenly try to become helpful when you ask for your money back on an ebook.