Fuze+ microsd card not recognized?

hi bob, under info i cant see the GB from the card. I dont see after plugin the card the “reading card screen” only the FAT 32 Error. i can go in the menu to the extern card but i dont see any stuff on them. thats strange… (Version 02.37.01F) has the firmware an error?

Edit: I plug the card to the fuze+ connect this to the pc and i CAN convert moviefiles to the crad with sansa media converter(this tool detect the card correctly). but i cant see any stuff on them in the fuze+. NOW iam really confused!