I updated my zc from 1.3.8a to 1.3.9a and then to 1.3.9b Done on my local host test site, Win7, XAMPP, PHP 5.2

FEC 1.8.0. installed with MOST files directly in but merged ones with big diff to 1.3.9 or because of other mod (Stock by Attributes - which is working): admin/orders.php; admin/packingslip.php, includes/classes/order.php, includes/languages/english/create account.php, include/languages/english/login.php, includes/modules/create account.php and two template files - tpl_checkout_success_default.php and tpl_login_default.php

For the css java script: html_header.php I tried using the FEC copy unmerged, and also tried the 1.3.9b copy unmerged. Merging these two files was beyond my ability. I didn't fiddle with the admin configures.

The mod is more or less working but

Issue 1 it is Slow and Difficult, more than Fast and Easy...so I must be doing something wrong. Putting one item in the cart was taking 15 - 30 seconds regardless of which html_header file I used.

Issue 2- changing shipping options on checkout from the default offered lowest cost. When set up as a one page checkout (FEC false, One Page true = 3 page checkout?) then I can select a shipping choice and when I continue to the next page, that choice is reflected in the pricing.

But if I select a one page check out (FEC true, One Page False - or both true) then when I select the preferred shipping, which causes the one-page to reload, the selection is not completed, but reverts to the originally presented cheapest option.

The fact that One Page = true means three pages, and One Page = false means a single checkout page also suggests to me I've done something wrong! Not sure if that's an Issue 3