Originally Posted by Krystian Galaj
Best check the entire filesystem on the card for errors.
Cybook software is embedded Linux. When such Linux finds any problem on filesystem, during normal operation, it puts the entire filesystem in read-only mode, for safety. It might not tell you that, it will continue operating normally, but from that moment on, until you fix the filesystem, it won't write anything into the files that remember bookmarks and your current position in book. So it won't be remembered.
But if that were the case, Alex wouldn't be able to set a bookmark on any
book on the SD card. My understanding is that the problem is occuring with one and only
Alex - have you tried moving the book to the Gen3's internal memory and seeing if it will save its initial position there? If it does, that's pretty conclusive proof that the problem lies with the card. If the problem persists there, it would suggest that the problem lies with the book.