That's why I asked to see a sample bookmark. It's important that a bookmark mark not just a file, but a POSITION in a file. For example, the bookmarks made by my Samsung YP-T8 look like [02:15:22 file1name.mp3]. This tells me both the relative and absolute position of the bookmark, since if there were several bookmarks for a file, I want to select the correct one. So if there were another bookmark in the list that was [03:44:05 file1name.mp3], I would know that the one that started with 03:44:05 was the later one. It's always a shame when a bookmark consists of only the file name and not a time stamp too.
But you're saying that the bookmark made by the Rockbox only contains the file name, which means that it doesn't tell me the absolute or relative position of the bookmark, which means that it is useless, and that the bookmark feature of Roxbox is therefore useless. On the other hand, if the bookmark includes the timestamp (i.e., the POSITION in a file), that would be useful, and good news to me.
Comprende?