I have upgraded from 4.15 to 4.60. I updated the wc.dll. When I go in the admin page, as soon as I try to access the "Show and Manage ISAPI Settings" option, I get:

Invalid Admin User Account or Login

I didn't change wc.ini and I am using the same account as before to login to that admin page.

This occurs only when I try to access that option from Internet Explorer. From Opera, it works.

Anyone knows what is causing this?