Please open a support web case and we'll try to determine the cause of the DRM error.<br /><br />To open a Digital Editions 1.5 Technical Support case, please use the contact links at http://www.adobe.com/support/digitaleditions. If you do choose to open a case please include a link to this discussion so the agent can see what I wrote..<br /><br />I don't know that there's any such thing as a 'no compatible' ebook. It is, however, possible to screw up the book's activations in such a way that it's then unreadable. <br /><br />So, looking at some internal docs, it looks like Voucher Engine error 147 only occurs with Acrobat reader 6, 7 or Digital Editions 1.0. <br /><br />The problem you are seeing is due, unfortunately, to corruption of your vouchers. The solution is to remove the old vouchers and create new ones.<br />o Exit Digital Editions <br />o Delete the folder Documents and Settings/<username>/Application Data/Adobe/Digital Editions/Voucher. <br />o Also delete the file manifest.xml in your My Digital Editions folder. <br />o Restart Digital Editions<br /> <br />Digital Editions should re-migrate your books and you should be able to open it again. IIf you bought your books using Acrobat or Reader, then you are done. For books bought with Adobe Digital Editions, you will need to re-download your books. Most vendors are happy to allow this.<br /><br />Again, if you're using ADE 1.5 you're -not- supposed to have this problem. But these are the pioneering days of ebooks, and as with all pioneers, sometimes there are problems.<br /><br />Regards,<br /><br />Bentley Wolfe<br />Senior Support Engineer, Flash/Flash Player/Digital Editions<br />Adobe