Sorry please ignore, realised it was my issues.
However, if anyone can help - as part of my zipship implementation I hardcode a list of cities into the checkout page as a select so that the user can't pick anything we don't deliver to. The zipcode is updated based on their selection. I could get this to work with earlier OPC but am struggling now that the billing and shipping are on the same page. I more or less have it working the way I want except that when I select a shipping city it keeps coming back with the 'Your City must contain a minimum of 2 characters.'
If someone could visit my test site and tell me what I'm doing wrong - tearing my hair out ...
http://61.245.139.145/zencart
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