I had one book from waterstones that would not work. I pressed them for a refund on that book – and eventually got one, as I to suspected a curupt DRM file. Since the upgrade all others have worked o.k. Mine was one head on by Ian Botham. (Be interesting if yours was the Same book). Try contacting elonex support as they were far more useful than the waterstone support. Hope all works out as once sorted the ereader is a great product.