Cannot remove detail from worksheet

I've got a worksheet with an issue I don't understand. I have defined a set of sample indices using "i:=0..Nx-1" then build a spreadsheet using vectors with those indices. I wanted to see the array values when Nx=4 so I set the value and all was ok. When I go to remove the detail ... the [0,1,2,3] display that is ... the rest of the worksheet fails with a message "The value must be a scalar or a matrix". I know I'm being a bit vague but I don't really know how to better explain it so I have attached both good and bad versions of the file.

Any help would be appreciated

Thanks,

Paul