double check your authorize.net account and make sure that test moce is not enabled.
if the account is set to test mode, it will over ride the x_test_request value passed by the eCart pages.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.