Ok, my current store/cart is toast - the checkout is apparently unfixable, and I'm trying to rework everything from a test install to make sure things work.

Now, I've got a code error on the detail pages of my template somehow!

the detail pages work wonderfully well on the original cart:
www.moebiusenterprises.com

but on the test cart, they're broken (there's even a code snippet out there)
www.moebiusenterprises.com/test

been racking my brain for hours... so any help is enormously appreciated!