[kevinrm]

The problem is not X-Cart, it's the browser. If you visit a certain site, fill in a login and password, then allow the browser to remember that, it will. If you have to use multiple logins and email address such as you do when you administer a customer's account, fill out the PayPal module data, etc, etc, unfortunately the browser will automatically fill that data in and if you are not careful it will cause all kinds of problems.

I have yet been able to figure out how to make the email/ password autofill feature more selective within a site on Safari, it just throws the same thing no matter what page you visit on the site.

I would recommend that you install one browser and use that exclusively for admin of x-cart, and another browser for the rest of the web.