I'm looking to change the text labels on the checkout page but when I modify this file the checkout page stops working. Even if I just open Cart.aspx in notepad and press save, making no changes, it breaks the checkout page.

How can I modify this part of the checkout process. All I need to do is rename Shipping Fee and Surcharge. Thanks for your attention and insight.

Thanks for the tip on v3.89. I'll use your FAQ and setup a test environment and check out v3.89. I'm just a little leary of it's Beta label. We are using v3.88 on DNN 5.5.1 and SQL 2005 Standard. I found a way to slipstream in the changes before installing the module or doing a repair install. I guess I could have just reregistered the .DLL after I made the change to the live site.