I think i'm having exactly the same problem.
I'm currently using cherry_zen template, and all is fine throughout the checkout process. However, i'm looking to move over to tvzen_jellyfish.
When testing a purchase, i get a blank screen where the 'checkout_confirmation' screen should appear, allowing me to then click through to my payment provider.
I have been testing this template on my old shop: www.sunplastics.info/shop and it all works fine.
However, when i test on my new shop, (www.sunplastics.co.uk/shop) i get the blank screen.
Any help much appreciated!
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