I'm having problems running gc backups from wiiflow from an sd card. I'm able to play usb hdd but it doesn't work on sd card. When wiiflow runs I click on GC logo, then I click on options and set partition to sd. The game displays i.e. Phantasy Star online episode 1 and 2 but when I run it I get a blank screen. The game works perfectly from an USB hdd. What is the problem?