That's Maloria, blame Maloria
After 30 minutes of contemplating the problem a few days back, I finally figured out how to do it. I already assume you've deleted the Maloria tileset, so what you have to do is go into your Graal folders, click on levels, then the notepad offlinetiledefs. In there you'll see a bunch of text about starting points for tilesets, and somewhere you'll see one that has to do with maloria. Delete that line, then enter pics0.png in it's place. Make sure that the co-ordinates are set to 0,0,0