I am on v1.3.9h
My site is http://tinyurl.com/6r9v7cm
I have the advanced shipper mod.

Searched all over the forums to find an answer to no avail.

I get a red block that says Communications Error - Please notify webmaster. Your credit card could not be authorized for this reason. Please correct the information and try again or contact us for further assistance.

Then to the right of Change Address image. Your billing address is shown to the left. The billing address should match the address on your credit card statement. You can change the billing address by clicking the Change Address button.

The address was correct (mine) and I get the same when I am in Testing Mode which is not address specific.

Curl is False

I am using Authorize.net (AIM) and have gone into authorize.net and adjusted all the AVS settings to see if I could get a working combination.

Not sure what else to try. So close to getting this cart rolling.