Big scary planet destroying space station.
Join Date:Joined: May 2011
I'd say you changed a setting in it to store to external SD maybe....and since we don't have one....it obviously won't work.
Just a guess.
If you can't figure it out, I'd try a factory reset first. If it's still messed up, flash stock again. Or ROM.
Backup with titanium backup first, if you want to save your user apps.