Adblock Plus

I tried to play a program on the CBS site; I've done this two or three times a year for many years with no problems, but this time the site said it could not load its ads (error 113), and therefore would not play the show. I've always watched the ads before, never a problem until now. I checked the icon for Adblock Plus, and it said that something had caused it to reset to default; it said I could fix this by removing and reinstalling Adblock Plus, which I did, but that made no difference. I don't know what default is, or what I had before (a friend set up my computer for me, so I don't know details), but I just want the CBS site to be able to load its ads so I can watch the program. What do I do? Thanks.