SpriteControl problems

Hi! This is for users that are familiar with SpriteControl (http://www.blitzbasic.com/codearcs/codearcs.php?code=456) :-)

Include "Sprite Control.bb"
Graphics3D 640,480
SetBuffer BackBuffer()

treasureMapSize = GraphicsHeight() ;based on the graphicsheight, I will also size the map to 
								   ;the screenwidth, since width is always bigger than height.
pieceSize = treasureMapSize / 4

Type kaartstukje
	Field entity
	Field id
End Type


mycamera=CreateCamera()
myspritecam = CreateSpriteCamera()


kaart = LoadImage3D ("kaart.jpg",1)
palen = LoadImage3D ("vb.png",2)

HandleImage3D kaart,-1,-1
DrawImage3D kaart,0,0
ResizeImage3D kaart,treasureMapSize,treasureMapSize 

HandleImage3D palen,-1,-1
DrawImage3D palen,0,0
ResizeImage3D palen,treasureMapSize,treasureMapSize 


RenderWorld
Flip
kaart_id=1

; chop the images in pieces
For y=0 To 3 
	For x=0 To 3  
		k.kaartstukje = New kaartstukje
		k\entity = GrabImage3D(x*pieceSize, y*pieceSize, pieceSize, pieceSize)
		k\id = kaart_id
		kaart_id=kaart_id+1
	Next
Next

; remove the big images, no need for them anymore
FreeEntity kaart
FreeEntity palen

;FlushKeys
;WaitKey

; draw them again
x=0 : y=0
For k.kaartstukje = Each kaartstukje
  	HandleImage3D k\entity,-1,-1	
	DrawImage3D k\entity, x*pieceSize+2, y*pieceSize+2
	x = x + 1 
	If x > 3 
		x = 0
		y = y + 1
		End If
		
Next
RenderWorld
Flip
	

WaitKey
End

Now what this code does: chop two displayed images into 16 pieces, and show them again (draw each chopped piece).
Weird enough piece #7 is also piece #5. And the loop is correct! I checked which coordinates are grabbed, and displayed again, so this shouldn't be possible!
First question: Someone knows what going on?

Second question: it grabs what is displayed on screen, but I do not want the user to see this. I tried hideEntity and cameraProjMode 0 but then the result is that nothing gets grabbed (because it is hidden).
How can I NOT show what's going on but still grab the image?

Thank you!