Just got my program guide working again on my FIOS cable box.  I configured my Actiontec router to bridge to my Linksys router last week.  Everything was great until my program guide stopped working. It turns out that the broadband Internet ethernet port wanted exclusive access to my internal
subnet. All that I had to do was assign my LAN ethernet port to a different subnet and then everything immediately worked!  Words do not accurately describe the configuration.  I am going to have to post a drawing.