If this is the result of the forum revamp, I don't know what to say. Whoever did this is an incompetent moron, and I say this as someone who has some webdev experience. It's absolutely avoidable and unacceptable to break links to a high-profile and information-rich online resource such as SC2Mapster. If the URL structure has changed, then old links should continue to work and redirect you to the new URLs.
It's infuriating to see so little thought and care given to website updates. Like you think it's okay to just sprinkle some long-overdue features on us (posting history, notifications, etc) while breaking everybody's bookmarks and undermining one of the basic principles of the web.