When trying to add a storage place, the sign-in window for entering user credentials does not appear. Instead, error message S_500 appears.
Authentication cookies are mandatory for accessing a storage place. Make sure that the authentication/credentials mechanism on the Team Server is allowed to use authentication cookies. It might be blocked by some (hidden) company/domain-wide MS-IE security policy.
Alternatively, you can try starting Enterprise Studio as an admin for adding a storage place (just for the user credentials). Then use it as a normal user as long as no changes are necessary to the storage place. Make sure the "IE Enhanced Security Configuration" is disabled.
If the above does not resolve the problem, please contact BiZZdesign Support