I'm posting this for two reasons... one to get some advice and two to inform others that "may" run into this issue.

One of my customer's is on a dedicated server. Their Merchant Account Provider has enlisted the services of SecurityMetrics - to do security audits to all their customer's eCommerce sites. Sadly, we failed; however the failure was strictly due to the Php Version currently on the server, which in our instance is Php 5.25 - Based on their review we need to upgrade to no less than 5.29, but 5.3 is preferable. We are running the latest version of Zen-Cart - 1.3.8a with all security fixes and admin relocation.

I know that a few weeks back I saw issues in the forum regarding installs on 5.3 having major issues, but for the life of me I can't find those posts now. This cart has extensive modifications so I will be checking for threads on some of those mods also, but in general, what issues will I encounter when I upgrade to 5.3.

This is a huge site (over 64G with nearly 20G db) with very heavy traffic and large sales volume, so I need to be prepared before I make the upgrade.

Again, any advice or heads up on what to expect with core code issues is really needed here and is much appreciated in advance for the assistance.

Ruth