Changing address problem in checkout

Hi all,

I've installed Zencart v1.3.8a
with a few addons, FEC, sitemap, and a few small addons which im sure isnt causing this problem.

My problem is at the checkout page for payment, shipping and billing. There are 2 buttons to change address for shipping and billing. When you click on this you will get a flash popup little window inside the same page which you can add a new address or select a previous one. This box does not work, if you input a new address or select a previous address and hit submit it still goes to main_page=checkout_shipping_address page where you have to input it again (so your previous input/selection was not saved or entered into the database at all).

Anyone having the same problem or know how to fix it?

Many Thanks,

Does it do the same thing if you turn off FEC ?

I've posted this in FEC thread also, first i thought it wasnt an FEC problem but now that you've ask to try it, I found out that the popup of the flash box to change address is only available when FEC is turned on.

If i turn it off changing address will go straight to main_page=checkout_shipping_address

which works, but i like the flash box to work as the customer remains on the checkout page and not having to go to main_page=checkout_shipping_address and back to checkout.

Same here popup not showing.
When I turn off the change address popup, it works, but I think the popup looks better.

It works. I can't tell how, because I didn't change anything, was still searching for the problem.