The problem is with the subset of Bluray discs that play the movie through their integrated Java software, rather than through the player’s own hardware. If this really annoys you, watch out for any discs indicated as “BD-J,” “Bonus View,” or “BD Live.” Having both a player and a disc that supports Java gives you some fancy extra features, like video commentary in a picture-in-picture. But it also prevents the player hardware from saving a simple resume-point like it does for DVD and non-Java Bluray. You may be able to save a bookmark from the menu instead.