I have been working on my test v1.5.5 site hoping to go live soon.
One problem I have found is that I can not change the address for billing and shipping by picking one in my address book.
The form insists on me filling out the form.
I am using the responsive classic template and it does the same with the green classic one.
Nothing in my log files.
I have addons: COWOA, giftwrap & Ultimate URLs.
My test site is password protected but I can take it off if someone wants to check the site.

Any ideas?