Yes, that's exactly how I described the problem in my email to Bookeen.
@Fourvin: try this one: http://www.comenondetto.net/CND.epub
(a gratis project that I did for a friend). If you open the TOC menu, try reaching the "COME NON DETTO" item: you should get to a "title page". Instead, you are forced to select one of the sub-items, which are the Chapter titles ("CAPITOLO UNO", "CAPITOLO DUE", and so on) and you are driven to the start of the relative chapter.