The login/session cookie pair is the one that controls the new post indicators. The login cookie persists, while the session cookie will expire when you close your browser. The login cookie will update when the session cookie is set.
The ubber cookie is used for authentication. It should persist if you choose the "Remember Me" option when logging in.
When you log out, the session cookie and ubber cookie are cleared.
The problems you're seeing are likely related to the logout. To avoid that problem, don't log out. <img src="https://www.ubbcentral.com/boards/images/graemlins/smile.gif" alt="" />
The cookies are working as intended. This is not a bug.
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