Bruce, he said, that he knew how it worked. It's not that he didn't select a ROM via NPK, but that the restore function as is, doesn't work.
I suggest you check your Cart after you tried to restore any savegames if it still holds any savegames. I suppose that your SRAM gets deleted or corrupted from NPK or your cartreader (which one do you have?), that's why the restore function seems not to work. It actually works, but it saves, thus restores an empty/ corrupted SRAM

. It's a common problem and well covered on this boards. Cory said, that it would be a trial and error situation to save and restore SRAM via NPK.
Good luck, and if you find something out, let me know, because I do have this very problem.
Greetings