I have Kobayashi Maru installed and every time I go to select a bridge it doesn't have the scroller buttons.
Before you begin the game, at the main menu screen, go to "configure", then "mutators" and there should be one in that menu that says something about a "bridge menu scroller". If you weren't already aware, when playing Quickbattle or Multi-player, all the mutators should be turned to "on". If this didn't help and you already knew about mutators try downloading this file which should replace the bridge scroller. If neither of these helped, you may have to reinstall your game, maybe