Dear all,
I have a problem on my localhost test site. It seems to be working fine on my live site.

The problem is during checkout, after clicking on "Confirm the order" button on Step 3 Order Confirmation (checkout_confirmation), it just waits until a internal server error message appears on the browser.

I check the cache directory and there is no error log generated.

The code is the same as on my live site, but the database content is different (it has got all the demo products). I use SVN to implement changes on this localhost test site and then merge changes across to my live site. So I can say that the code is the same. I've removed all test changes from the localhost.

When I check my Orders in Admin, the order has correctly been entered into the database and I can see it. I can also see the order from my Customer log in on the store side.

The items in the cart still remains when I re-load the store, and I am still logged in as a customer.

It seems to be partially working, except it never gets to the checkout_success page on my localhost test site.

Any ideas what could be going on?