Cheap card. Sorry bloke, but it's true. When it comes to save cards ALWAYS buy the OFFICIAL stuff. Much more expensive, but it works without error. Alot of the 3rd party hardware is incredibly cheap and very slow. Not only is it prone to random corruption but the clockrate on shit memory makes some games un-able to save. E.G. Burnout 2 on the GC. is a very popular example of the universal failings of cheap memory cards.
dude i had the same problem! u don't click or press or whatever on the games icon, u have to hit right and click on the actual little files WITHIN that game, trust me that works, it has nothign to do with being 3rd party.