Hi,
I have had to move a shops URL, and basically copied everything over from a 1.3.6 cart. So, I decided it would be a good idea to update the cart at the same time to 1.3.7 All seemed to go well, except when i purchase an item, i go through the appropriate stages and all is as it should be until the final 'success page'.

Instead of the page i get an error '500 Internal server error', I checked the error logs on the server and they are not showing anything up for concern related to this problem. I just don't know what else to try, i have checked the pages that i think are concerned with the checkout and success process, and checked with the version from 1.3.7 and they are exact.

have checked the configure.php files both in admin and includes, and can find nothing wrong with either of those, settings wise.

Please help if you can, many thanks.