@OP
Your experience with the 16gb Sandisk card is strange indeed. All seems to be well until you try to play FLACs on it. All I can say is to return that card, if you haven’t done so already, and just get another, even if it’s also another Sandisk 16gb card. Whether it’s a class 2 or a class 4 matters not.
I’ve used 8gb class 2 and 32gb class 4 Sandisk cards in my fuze to play FLACs ripped from CDs using MediaMonkey and I have never had any trouble whatsoever. They are properly tagged FLACs without added clutter and with embedded album art. I just use the drag-and-drop method to get the files onto the fuze in MSC mode. They’re in folders by artist, then subfolders by album. With the CDs that have multiple discs, I also use subfolders by title and Disc number inside the album folder.
