The forum software has been updated too the latest version of the software that is available at the time of the post.
If you had previously logged in the board with the Remember me checked and had to login in the first time when you visit the site since the updated forum. The cookie of the site had become corrupted and was set to the correct setting, and you should be now able to click remember me and the login should "stick". If there is a problem (any problem not just the login, please let a member of the admin staff know and it will be taken care of.