We have updated our forums to the latest version. If you had an account you should be able to log in and use it as before. If not please create an account and we look forward to having you as a member.
One of my gripes with Steam is it doesn't notify of changes in versions or identify the version in use. Makes it difficult for the developers to troubleshoot a problem because it's not obvious whether the problem is "new" or a residual problem from an earlier version that somehow hadn't been updated.