Using Zencart 1.5.1

I have installed including the patch for MySQL. I even tried within myPHP admin. I cannot see any changes at all on the site?
I have definitely uploaded the new files in correct places as per instructions. I am familiar with adding MODs.

Can anyone perhaps suggest a solution?

PS: includes/functions/functions_price.php file in merge looked very different so I just uploaded the whole new includes/functions/functions_price.php file as is to replace my old one.