Do you get the following Authorize.net error message when you are trying to do a Webtix refund in Authorize.net: “Error. An unanticipated error occurred while processing this request. Please click your browser’s Back button to return to the previous page.”?
When this happened to one of our Wintix users, she contacted Authorize.net, where they discovered that when the refund window popped open, there were special characters in the Description field. That was what was causing the error message.