When I try to set my forums into the "last 30 days" it doesn't work on all forums. When set, it works for that day only. I want all my forum choices to be last 30 days only. What do I have to do?

the 30 day setting is for current session only. the default is to show all topics and that is what you would see when entering the board after a new session. custom look back settings are not yet implemented