Quote Originally Posted by hey_you View Post
I'm also having issues with addresses being changed...it seems to work if everything is entered correctly, but if there's an error in one field, it just does nothing - no error messages are shown, and the change address box is closed with no change.
I'm using FEC 1.8 on ZC 1.3.9b
I just tried it on my setup (FEC 1.80 and Zen-Cart 1.3.9b) and it worked as it should. I left off a field on the new address and it came back with an error message and the address page for me to correct it. When I corrected it, it went forward as it should. I am setup as a single page checkout.

Did you just install the FEC 180 or merge files?