Exploding blocks that have been scaled non-uniformly?

Hello,

I have a surface model that I need to scale in X and Y but not Z.  I've been told I need to make the surfaces a block to scale them non-uniformly together.  My problem is after scaling the block it won't allow me to explode it even though I allowed exploding while making the block.  Does anyone have any suggestions or a better way to scale my models?

Thanks,

Steve

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