random w/o replacement is still replacing

[Diana]

Hi all, 

I have a memory task that displays a series of images in different 
locations on the screen. The participant is expected to remember the image 
and its location, so when the images are pulled randomly from a nested 
list, the participant can match the image to the original location. 

The problem I am encountering involves the random pulling of images to be 
matched. I need this to happen without replacement, but even with the 
selection order set to 'random', I'm having at least one image being pulled 
twice and one image not pulled at all. 

I have no idea how to fix this problem. Is there anyone that can share some 
insight?
 
Thanks for the time,
Dazed & Confused (Diana)

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