If you visit http://liquibase.org/forum you will notice that it looks completely different. We were getting hit pretty hard with spam over the last few months on the old forum and I concluded that we could not stop it with the current simple machines software. As a result, we have moved to a Zoho-based forum.
There were suggestions to simply go with Google Groups, but in the end Zoho provided question-tracking features I liked as well as the ability to import in all the old forum topics and so I went with them.
Please check out the new forum and let me know if you have any suggestions or questions on it.