Hi
I've gone through a process today on a site currently running Zen Cart 1.3.7. I want to upgrade the whole site to the newest version and am in the process of doing that in the background, but my customer wanted the Lightbox and I found a version that runs on 1.3.7.1. So, today I added all the required patches to bring it to 1.3.7.1 and applied the Lightbox.
However, although it all looks fine, when you click on the Checkout button from the shopping basket, you get a blank page and a Server 500 error.
I'm unsure where to start looking at the cause of this because the file it's trying to display is main_page=checkout_shipping and I'm sure I haven't made any changes to the shipping templates.
If anyone could give me a steer on how to debug this I'd really appreciate it, it's either that or undo everything I've done today.
Thanks in advance
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