Dragon Quest - The Chapters of the Chosen Europe

I load it up and it's completely black. I've tried different save types, even tried nocash, opengl, and none. Natta, zilch. Any ideas?

Back Up All Your Files And Reformat Your SD Card...If You Delete Games & Save Files On The R4 From Your DS It Shows That Its Gone But The Space It Takes Up On Your SD Card....Its Best To Delete Games From Your Computer Itself...I Don't Know If Thats Your Problem But You Should Try Reformatting It....

When trying to drag it on to R4, it complains theres not enough space when theres no games on it (its a 2gig microsd card) its a 128mb file so should work like a charm. any idea how to sort it? thanks