I've seen many similar posts on the forurm regarding just seeing the never-ending "Loading..." message (originating from https://js.authorize.net/v3/acceptMain/acceptMain.html) on slow network connections. My client experiences this often but I'm only able to recreate it when 1) I throttle the network down to 3G speeds and 2) disable browser caching. I do not see any script errors in the console and all network traffic has completed before I click the payment button. The SCRIPT tag to load AcceptUI.hs appears on the page directly after the "button".

Has anyone found a solution for this problem?